High-resolution optical disk for recording stereoscopic video, optical disk reproducing device, and optical disk recording device

ABSTRACT

An optical disk for recording stereoscopic videos and high-quality video signals and a system for reproducing the videos and signals from the optical disk are made compatible with the conventional video reproducing system. A reproducing device which is used for reproducing stereoscopic videos and high-quality videos obtains stereoscopic video or high-quality videos by reproducing both first and second interleaved blocks on the optical disk in which first and second video signals are alternately recorded on the left and right sides by dividing the first and second video signals into frame groups of one GOP or more and a reproducing device which is not used for reproducing the stereoscopic videos and high-quality videos obtains ordinary videos by only reproducing either the first or second interleaved block by jumping tracks.

FIELD OF THE INVENTION

[0001] The present invention relates to an optical disk in whichstereoscopic videos and high-quality videos are recorded, and areproducing device and a recording device of such optical disk.

BACKGROUND OF THE INVENTION

[0002] Hitherto, as an optical disk in which stereoscopic moving pictureis recorded, and its reproducing device, the structure as shown in FIG.10 is known. Herein, in an optical disk 201, right-eye signals arerecorded alternately in even-field regions 204, 204 a, 204 b, andleft-eye signals, in odd-field regions 203, 203 a, 203 b. When suchoptical disk 201 is reproduced by an existing optical disk reproducingdevice 205 as shown in FIG. 11, the right-eye images and left-eye imagesappear on a TV 206 alternately in every {fraction (1/60)} second. Withthe naked eye, only the right-eye and left-eye images appear to be aduplicate image. However, when observed through stereoscopic goggles 207for changing over the right-eye and left-eye shutters once in every{fraction (1/60)} second, a stereoscopic image is seen. As shown in FIG.12, the right-eye image and left-eye image are alternately encoded inevery field in the interlace signals in one GOP of MPEG signal. Ashigh-quality videos, the progressive system is being studied.

[0003] Problems in the prior art are discussed. When a conventionalstereoscopic optical disk is reproduced in a standard reproducingdevice, an ordinary image which is not stereoscopic image, that is, 2Dimage is not delivered. A stereoscopic optical disk cannot be reproducedby a reproducing device unless a stereoscopic display is connectedthereto. It was hence necessary to fabricate two types in the samecontents, that is, a stereoscopic optical disk and a 2D optical disk. Itis the same for high-quality videos. That is, the conventionalstereoscopic and high-quality optical disks were not compatible withordinary videos. A purpose of the invention is described below. It is apurpose of the invention to present a mutually compatible stereoscopicand high-quality optical disk and a reproducing system. As thedefinition of compatibility is clarified, the compatibility may be justcompared to the relation between the monaural record and stereo recordin the past. That is, a new stereoscopic optical disk is reproduced as amono-vision, that is, 2D with an existing reproducing device, and isreproduced as either mono-vision or stereo-vision, that is, stereoscopicvideo with a new reproducing device.

SUMMARY OF THE INVENTION

[0004] To achieve the object, in the optical disk of the invention,first, two moving pictures for right and left eye at a frame rate of 30frames/sec each are entered, a video data unit is compiled by combiningone GOP or more of images of plural frames of video data of one eye orfield components of progressive image, an interleaved block consistingof said video data unit is provided so that one video data unit isrecorded by one revolution or more on the track of the optical disk, theright and left video data units are recorded so as to be interleaved,that is, disposed alternately, and information of video identifier ofstereoscopic video and high-quality video is recorded.

[0005] When this optical disk is played back in an optical diskreproducing device for ordinary 2D reproduction, an ordinary 2D movingpicture is reproduced.

[0006] The reproducing device applicable to stereoscopic videos andhigh-quality video of the invention comprises means for reproducingvideo identifier information from the optical disk, means forreproducing 2D video by a conventional procedure according to thisinformation, means for reproducing 3D video or high-quality video, andmeans for issuing stereoscopic video and high-quality video.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007]FIG. 1 is a block diagram showing a recording device in anembodiment of the invention,

[0008]FIG. 2 is a time chart showing the relation of input signal andrecorded signal in the embodiment of the invention, and

[0009]FIG. 3 is a top view of an optical disk showing an arrangement ofinterleaved block on the optical disk in the embodiment of theinvention.

[0010]FIG. 4 is a diagram showing stereoscopic video arrangementinformation in an embodiment of the invention,

[0011]FIG. 5 is a diagram showing a reproducing device of stereoscopicvideo in the embodiment of the invention, and

[0012]FIG. 6 is a time chart showing the relation of signals recorded inthe reproducing device and video output signals in the embodiment of theinvention.

[0013]FIG. 7 is a block diagram showing an MPEG decoder of a reproducingdevice in an embodiment of the invention,

[0014]FIG. 8 is a time chart showing the relation between recordedsignals and output signals in 2D reproduction of the reproducing devicein the embodiment of the invention,

[0015]FIG. 9 is a block diagram showing a 2D type reproducing device inthe embodiment of the invention, and

[0016]FIG. 10 is a top view showing data arrangement of optical diskrecording stereoscopic video in a prior example.

[0017]FIG. 11 is a block diagram of a reproducing device for reproducingan optical disk recording stereoscopic videos in a prior example,

[0018]FIG. 12 is a time chart showing the relation of recorded signalsand video output by reproducing a stereoscopic video type optical diskin the prior example, and

[0019]FIG. 13 is a time chart showing the relation of virtualstereoscopic video identifier, R output and L output in an embodiment ofthe invention.

[0020]FIG. 14 is a reproduction sequence diagram showing difference inpointer access between ordinary video reproduction mode and stereoscopicvideo reproduction mode in an embodiment of the invention,

[0021]FIG. 15 is a flow chart (1) changing the access procedure ofpointers when reproducing and when not reproducing the stereoscopicvideo signals in the embodiment of the invention, and

[0022]FIG. 16 is a flow chart (2) changing the access procedure ofpointers when reproducing and when not reproducing the stereoscopicvideo signals in the embodiment of the invention.

[0023]FIG. 17 is a flowchart for changing output depending on whetherstereoscopic video is present or not in a stereoscopic video reproducingdevice in an embodiment of the invention,

[0024]FIG. 18 is a diagram showing the state of a stereoscopic videoidentifier entered in the stereoscopic video logic arrangement table inthe embodiment of the invention,

[0025]FIG. 19 is a flowchart showing the procedure of specifying theattribute of stereoscopic video of each chapter, each cell and eachinterleaved block from the stereoscopic video identifier of thestereoscopic video logic arrangement table in the embodiment of theinvention, and

[0026]FIG. 20 is a block diagram of interlace video signal output modeof the reproducing device in the embodiment of the invention.

[0027]FIG. 21 is a block diagram in output mode of progressive videosignal of a reproducing device in an embodiment of the invention,

[0028]FIG. 22 is a block diagram in input mode of progressive videosignal of a recording device in the embodiment of the invention, and

[0029]FIG. 23 is a block diagram in input mode of stereoscopic videosignal of the recording device in the embodiment of the invention.

[0030]FIG. 24 is a block diagram in reproducing mode of stereoscopicvideo signal of a reproducing device in an embodiment of the invention,

[0031]FIG. 25 is a block diagram in reproducing mode of stereoscopicprogressive video signal of four-speed reproducing device in theembodiment of the invention, and

[0032]FIG. 26 is a block diagram in progressive video reproduction ofmulti-stream of the reproducing device in the embodiment of theinvention.

[0033]FIG. 27 is a diagram showing an entire data structure of opticaldisk in an embodiment of the invention,

[0034]FIG. 28 is a diagram showing an internal structure of volumeinformation file in FIG. 27 in the embodiment of the invention,

[0035]FIG. 29 is a flowchart showing a detailed procedure of reproducingprocess of program chain group by a system control unit M1-9 in theembodiment of the invention, and

[0036]FIG. 30 is a block diagram showing a partial constitution for AVsynchronization relating to AV synchronous control 12-10 in theembodiment of the invention.

[0037]FIG. 31 is a timing chart of reproduction output through bufferand decoding processing of decoder of data stream in an embodiment ofthe invention,

[0038]FIG. 32 is a diagram showing a method of decreasing interlacedisturbance by filter on/off in the case of obtaining interlace signalin the embodiment of the invention, and

[0039]FIG. 33 is a diagram showing a recording method for adjusting theformat when recording into a DVD in the embodiment of the invention.

[0040]FIG. 34 is a diagram showing a timing control method in the caseof reproducing from a DVD in an embodiment of the invention,

[0041]FIG. 35 is a time chart showing reproduction of interleaved blockat the time of video stream changeover in the embodiment of theinvention, and

[0042]FIG. 36 is a principle diagram for recording two progressive videosignals by dividing into interleaved blocks in the embodiment of theinvention.

[0043]FIG. 37 is a flowchart for skipping an initial dummy field of VOB(VIDEO OBJECT) in an embodiment of the invention,

[0044]FIG. 38 is a flowchart of STC changeover in the case of seamlessconnection in the embodiment of the invention,

[0045]FIG. 39 is a block diagram of data compound processing unit in theembodiment of the invention, and

[0046]FIG. 40 is a principle diagram for recording interleaved block byseparating the scope (wide) video in the horizontal direction in theembodiment of the invention.

[0047]FIG. 41 is a principle diagram of 3-2 transformation by combiningscope video from an optical disk in which scope (wide) video isseparated and recorded in an embodiment of the invention,

[0048]FIG. 42 is a composition diagram of system stream and video dataof an optical disk in the embodiment of the invention, and

[0049]FIG. 43 is a flowchart of seamless connection in the embodiment ofthe invention.

[0050]FIG. 44 is a diagram showing a method of separating interpolationinformation in the horizontal and vertical direction and recording ininterleaved blocks in an embodiment of the invention,

[0051]FIG. 45 is a timing chart of progressive, stereoscopic and widesignals and data quantity of buffer at the time of reproduction thereofin the embodiment of the invention, and

[0052]FIG. 46 is a structural diagram of horizontal filter and verticalfilter in the embodiment of the invention.

[0053]FIG. 47 is a signal arrangement diagram for inserting dummy fieldsin an embodiment of the invention,

[0054]FIG. 48 is a time chart of encoding progressive signals by usingan existing encoder in the embodiment of the invention,

[0055]FIG. 49 is a signal format of video identifier in the embodimentof the invention, and

[0056]FIG. 50 shows contents of identifiers of vertical filter andhorizontal filter in the embodiment of the invention.

[0057]FIG. 51 is a diagram showing a principle of divided recording of1050 interlace signal in an embodiment of the invention,

[0058]FIG. 52 is a signal arrangement diagram for issuing progressivesignal, NTSC signal, HDTV signal in the embodiment of the invention,FIG.

[0059]53 is a progressive reproducing method for reproducing interleavedblocks while referring to the video present time stamp in the embodimentof the invention,

[0060]FIG. 54 is an arrangement diagram of HDTV sub signal and NTSCsignal of simultaneous broadcasting system in the embodiment of theinvention, and

[0061]FIG. 55 is a block diagram of reproducing device for common diskof HDTV and NTSC of simultaneous broadcasting system in the embodimentof the invention.

PREFERRED EMBODIMENT OF THE INVENTION

[0062] Referring now to the drawings, preferred embodiments of theinvention are specifically described below.

[0063] The method of recording and reproducing stereoscopic videos (3-Dvideos) and high resolution videos is described in the first half, andthe method of realizing high-resolution videos is discussed in thesecond half.

[0064] In recording of the invention, in the case of stereoscopic videoor wide video, two screens of the right eye and left eye, or two screensdivided in the horizontal direction are recorded separately. The twoscreens are field videos starting from an odd-number line, which arecalled odd-first signals. When recording a progressive video by dividinginto two screens in the vertical direction, these two screens consist ofa field signal starting from an odd-number line and a field signalstarting from an even-number line, which are respectively calledodd-first signal and even-first signal.

[0065] In this specification, an interleaved recording unit of videoinformation of one GOP or more is called an interleaved block or a framegroup.

[0066]FIG. 1 is a block diagram of an optical disk recording device 2 ofthe invention. A signal for the right eye of a stereoscopic image iscalled an R-TV signal, and a signal for the left eye is called an L-TVsignal, and the R-TV signal and L-TV signal are compressed into MPEGsignals by MPEG encoders 3 a, 3 b, and an R-MPEG signal and an L-MPEGsignal as shown in FIG. 2(2) are obtained. These signals are interleavedin an interleave circuit 4, as shown in FIG. 2(3), so that an R framegroup 6 by combining R frames 5 of R-MPEG signals by the number offrames of one GOP or more into a frame group, and an L frame group 8 bycombining L frames 7 of L-MPEG signals by the number of frames of oneGOP or more may be disposed alternately. This recording unit is calledan interleaved block, or called a frame group in the specification. Inorder that the right-eye signal and left-eye signal may be synchronizedwhen reproducing, the number of frames in the R frame group 6 and Lframe group 8 is same as the number of frames in the same duration. Thisis also called the video data unit, and in one unit, data for theduration of 0.4 sec to 1 sec is recorded. In the case of DVD, on theother hand, the innermost circumference is 1440 rpm, that is, 24 Hz.Accordingly, as shown in FIG. 2(4), the interleaved block is recordedfor more than one revolution to more than ten revolutions of the disk.Back to FIG. 1, the address information is issued from an addresscircuit 13, and stereoscopic video arrangement information is issuedfrom a stereoscopic video arrangement information output unit 10, and isrecorded on an optical disk by a recording circuit 9. This stereoscopicvideo arrangement information includes an identifier showing whether thestereoscopic video is present on the optical disk or not, or astereoscopic video arrangement table 14 shown in FIG. 4. As shown inFIG. 4, the channel numbers arranging R and L stereoscopic videos, startaddress and end address are presented. On the basis of such arrangementinformation and identification information, in the reproducing device,stereoscopic videos are correctly issued as R and L outputs. Therefore,if different ordinary videos are issued to R and L by mistake, thevideos are not related to the right eye and left eye of the viewer, sothat discomfort is given. The stereoscopic video arrangement informationor stereoscopic video identifier is effective for preventing output ofsuch uncomfortable videos. The method is more specifically described inthe following explanation of the reproducing device.

[0067] Herein, a specific method of realizing stereoscopic videoarrangement information is described. In the case of an optical diskconforming to DVD standard, files of directory of contents andinformation of table of contents are standardized and recorded in arecord starting region of the optical disk. These files, however, do notcontain description about stereoscopic videos. Accordingly, astereoscopic video logic arrangement file 53 containing a stereoscopicvideo logic arrangement table 51 shown in FIG. 18 is provided, and thisfile is read by a reproducing device corresponding to stereoscopicvideo. An ordinary 2D reproducing device does not read the stereoscopicvideo logic arrangement file 53, but does not reproduce 3D, and hencethere is no problem.

[0068]FIG. 18 is explained. Video information of DVD consists of threelogic layers. They are video title set (VTS) layer showing the title ofthe movie or the like, part of video title (PVT) layer showing chaptersin the title, and cell layer showing stream in the chapter.

[0069] The arrangement of stereoscopic video is shown in each layer. 000means there is no stereoscopic video or progressive at all. 110 means anentire stereoscopic video. 001 means a mixture of stereoscopic portionand non-stereoscopic portion. In FIG. 18, title 1 of VTS layer is 001meaning a mixture of 3D and ordinary video, title 2 is 110 meaning anentire stereoscopic video. Title 3 is 000 meaning there is nostereoscopic video. Therefore, in the layers beneath titles 2 and 3,stereoscopic information is not necessary.

[0070] In the PVT layer of title 1, chapter 2 is 000 meaning there is nostereoscopic cell, and chapter 3 is 110 meaning all cells arestereoscopic. Therefor, stereoscopic information is not necessary in thecell layer. Chapter 1 is 001 meaning a mixture of stereoscopic cells andordinary cells. In the cell layer of chapter 1, cells 1 and 2 are R andL of first story, cells 3 and 4 are R and L of second story, and cells 5and 6 contain recording of ordinary videos. In this way, by recordingthe stereoscopic video logic arrangement file separately in the opticaldisk, the conventional file is not changed, and hence compatibility ismaintained. Moreover, by this logic information, all physicalinformation on the optical disk is known, and it hence prevents sucherror as to display ordinary videos of two different contents in theright and left eyes. Still more, by adequately reproducing thestereoscopic video and decoding, videos of R and L can be given to theright eye and left eye from the correct output units.

[0071] Referring to the flowchart in FIG. 19, the procedure of judgingwhether each cell is stereoscopic video or not from the stereoscopicvideo logic arrangement table is shown. At step 51 a, the stereoscopicvideo logic arrangement table 52 is read out from the first recordregion of optical disk. At step 51 b, the content of the VTS layer shownin FIG. 18 of title n is checked, and if 000, it is judged to be not astereoscopic cell, and 3D processing is not done. At step 51 c, ifVTS=110, all cells are handled as 3D at step 51 d, and odd cell=R andeven cell=L are handled at step 51 e. At step 51 f, the display that allcells in title n are stereoscopic is shown in the menu screen. At step51 g, if VTS=001, at step 51 i, the arrangement information of chapter nin the lower layer is checked, and at step 51 j, if PVT=000, at step 51k, it is judged there is no 3D cell in chapter n, at step 51 m, ifPVT=110, at step 51 n, all cells in the chapter are judged to be 3D, andadvancing to step 51 d, same as stated above, the display that thecorresponding chapter is stereoscopic is added to the menu screen. Backto step 51 p, if PVT=001, cell number=n in the chapter of PVT=001 ischecked one by one, and at step 51 s, if cell=000, it is judged not 3D,and the process returns to step 51 q. At step 51 u, if cell=m−R, at step51 v, it is judged to be R of m story, and at step 51 w, if cell=m−L, atstep 51 x, it is judged to be L of m story, and next cell is checked atstep 51 q.

[0072] In this way, by additional recording of the stereoscopic videologic arrangement table 52 in FIG. 18, it provides an effect of judgingwhether titles, chapters and cells of all videos are stereoscopic ornot.

[0073] This is further explained in a top view of a disk in FIG. 3. Onespiral track is formed in a disk 1, and an R frame group 6 is recordedin a plurality of tracks of R tracks 11, 11 a, 11 b. Actually, it isrecorded in 5 to 24 tracks. An L frame group 8 is recorded in L tracks12, 12 a, 12 b, and next R frame group 6 a, in R tracks 11 c, 11 d, 11e.

[0074] The reproducing operation is described by referring to the blockdiagram of 3D reproducing device of the invention in FIG. 5, and thetiming chart in FIG. 6. When a signal is reproduced from the opticaldisk 1 by an optical head 15 and an optical reproducing circuit 24, anda stereoscopic video identifier is detected by a stereoscopic videoarrangement information reproducing unit 26, or when video datadesignated to be stereoscopic video in a stereoscopic video arrangementtable 14 as shown in FIG. 4 is reproduced, if a stereoscopic videooutput is instructed from an input unit 19 or the like, the stereoscopicvideo is processed, and, at the same time, a SW unit 27 is controlled,and R signal and L signal are issued from an R output unit 29 and an Loutput unit 30, and R and L are issued alternately in each field from anRL mixed output unit 28.

[0075] Referring to FIG. 5 and FIG. 6, operation of stereoscopic videoreproduction is described. On the optical disk, as explained in FIG.2(3), R frame group 6 and L frame group 8 having frames of one GOP ormore each are recorded alternately. In FIG. 6, (1) shows an entire view,and (2) shows a partial view. The output signal of the opticalreproducing circuit 24 in FIG. 5 is as shown in FIG. 6(2). This signalis separated into R signal and L signal in the SW unit 25, and the timeaxis of the R signal and L signal is matched with the original time bymeans of a first buffer circuit 23 a and a second buffer circuit 23 b,respectively. As a result, input signals of R and L-MPEG decoders areobtained as shown in FIGS. 6(4), (5). By processing these signals inMPEG decoders 16 a, 16 b in FIG. 5, mutually synchronized R and L outputsignals are sent into a video output unit 31 as shown in FIGS. 6(6),(7). The audio signal is expanded and issued in an audio output unit 32.

[0076] In this way, two outputs of R and L are issued simultaneously,and therefore in a stereoscopic TV of two outputs of R and L, by sendingsignals of 60 fps (frames per second) each from R output unit 29 and Loutput unit 30, a flicker-less video is obtained. From the RL mixedoutput unit 28, by sending an RL mixed output of 60 fields/sec, a 3Dvideo can be viewed, although there is flicker, by the conventional TVand 3D goggles. By issuing an RL mixed output of 120 fields/sec, aflicker-less 3D video can be viewed by using double scan TV and 3Dgoggles. Besides, in spite of stereoscopic video contents, ifstereoscopic output is not made, a signal is added by a “stereoscopic”display signal output unit 33, and a symbol meaning stereoscopic isdisplayed in the TV screen. As a result, the user is informed of thefact that the stereoscopic video is being observed in 2D mode, and isurged to change over to the stereoscopic output.

[0077] In the block diagram in FIG. 5, two MPEG decoders are used, butas shown in FIG. 7, the R-MPEG signal and L-MPEG signal may be combinedinto one MPEG signal in a combining unit 36, a double clock is generatedby a double clock generating unit 37, double operation and expansion aredone in a double clock type MPEG decoder 16 c, and R and L video signalsare issued from a separating unit 38, so that the constitution may besimplified in such circuit configuration. In this case, as compared withthe 2D reproducing device, it is enough to add only a 16 MB SD-RAM tothe memory 39, so that the cost increase is small.

[0078] Next is described the procedure of rotating at single speed andtaking out only R signal. The standard rotation of the DVD reproducingdevice is called the single speed, and double rotation of the standardis called the double speed. Since it is not necessary to rotate themotor 34 at double speed, a single speed command is sent from a controlunit 21 to a rotating speed change circuit 35, and the rotating speed islowered. The procedure of taking out only R signal at single speed fromthe optical disk in which R signal and L signal are recorded isdescribed by referring to the time chart in FIG. 8. As explained inFIGS. 6(1), (2), R frame groups 6 and L frame groups 8 are alternatelyrecorded in the optical disk of the invention. This state is shown inFIGS. 8(1), (2).

[0079] Comparing this signal and the one-rotation signal of the disk inFIG. 8(3), it is known that the optical disk rotates 5 to 20 revolutionsduring reproduction of one frame group. When the optical head jumpstracks from the R frame group 6 to R frame group 6 a, the track jumpingtime to the adjacent track takes scores of microseconds. Supposing therotation waiting time to be a maximum of one revolution, data of the Rframe group 6 a can be reproduced in two revolutions. This is shown inthe reproduction signal diagram and the time chart of one-revolutionsignal of disk in FIGS. 8(4), (5). In the reproduction signal in FIG.8(4), the time axis is adjusted by the buffer circuit 23 a in FIG. 5,and a continuous R frame MPEG signal as shown in FIG. 8(6) is issuedfrom the buffer 23 a. This signal is expanded by the MPEG decoder 16 aas an R video signal as shown in FIG. 8(7). Same as the R signal, byselecting other channel, a 2D signal of L signal is obtained. Thus, asin the invention, by assigning R or L in the frame signal group of oneGOP or more, and recording the frame signal group continuously overplural tracks, it provides an effect of obtaining 2D output of R only,if a 3D optical disk is reproduced, even by the single speed reproducingdevice.

[0080] Hence, as shown in the block diagram in FIG. 9, by using onebuffer circuit 23 of the 3D reproducing device in FIG. 5, one MPEGdecoder 16, and one video output unit 17, a 2D-only reproducing devicecan be composed. This 2D reproducing device 40 includes a stereoscopicvideo arrangement information reproducing unit 26, and the identifierand arrangement information of stereoscopic video of a 3D optical disk 1are reproduced. Therefore, when the 3D optical disk is recorded in the2D reproducing device, either one of R and L channels is issued. Since Rand L have same videos, it is a waste of time to issue by changing overthe channels in a channel selecting unit 20. In this invention, however,a stereoscopic channel output limiting unit 41 limits the output to onechannel only, for example, R of stereoscopic video by using thestereoscopic video identifier. As a result, only one of R and L of thesame video contents can be selected, so that the user does not have toselect an unnecessary channel.

[0081] In the case of stereoscopic contents, the “stereoscopic” displayis shown in a display unit 42 of the reproducing device by a“stereoscopic” display signal output unit 33, so that the user canrecognize the stereoscopic contents. Thus, in the optical disk of theinvention, 2D and stereoscopic videos are obtained in the stereoscopicreproducing device 43 in FIG. 5, and 2D videos are obtained in the 2Dreproducing device in FIG. 9, so that the compatibility is realized.

[0082] Back to the 3D reproducing device, the method of use and effectof the stereoscopic video identifier are described.

[0083]FIG. 13 is a time chart of stereoscopic video identifier andoutput signal. If the time after FIG. 13(3) is defined as oneinterleaved block time unit, there is a delay time of It, but it is notshown in the chart. The stereoscopic video identifier in FIG. 13(1) ischanged from 1 to 0 at t=t7. As recorded signals in FIG. 13(2), from t1to t7, R frame groups 6, 6 a, 6 b and L frame groups 8, 8 a, 8 b ofstereoscopic videos are recorded. In t7 to till, on the other hand,completely different contents A and B are recorded as first frame groups44, 44 a, and second frame groups 45, 45 a. In the standard of DVD,etc., there is no definition of stereoscopic video, and hencestereoscopic video identifier is not included in the data or directoryinformation. Therefore, upon start of the optical disk, it is requiredto read out the stereoscopic video arrangement information file of theinvention. In R output and L output in FIG. 13(3), (4), from t1 to t7,the data in first time domains 46, 46 a, 46 b may be directly issued toR output, and the data in second time domains 47, 47 a, 47 b, directlyto L output. After t=t7, there is no stereoscopic video identifier, andtherefore the same data as in first time domains 46 c, 46 d are issuedto the R output and L output. In other output system, that is, in amixed output in FIGS. 13(5), (6), from t1 to t7 in which thestereoscopic video identifier is 1, at the field frequency of 60 Hz or120 Hz, even field signals 48, 48 a and odd field signals 49, 49 a areissued alternately from one output. The data of the first time domains46, 46 a are issued to the even field signals, and the data of thesecond time domains 47, 47 a, to the odd field signals.

[0084] However, after t7 having no stereoscopic video, the data of thefirst time domains 46 c, 46 d are issued to both even field signals 48d, 48 e and odd field signals 49 d, 49 e.

[0085] Thus, by varying the output to the stereoscopic display ofsignals between the region in which the absence of stereoscopic video isindicted by the stereoscopic video arrangement information and theregion not indicated, it is effective to prevent input of videos ofdifferent contents into the right eye and left eye of the viewer.Without this function, while observing the right image and left image ofthe same content of the stereoscopic video, when the contents of thevideo become different between the first time domain and second timedomain in the optical disk, abnormal images are shown, contents of A inthe right eye and contents of B in the left eyes, which gives discomfortto the viewer.

[0086] This procedure is more specifically described by referring to theflowchart in FIG. 17. At step 50 a, an optical disk is loaded, and atstep 50 b, the file of contents list of the disk is read. Herein, thereis no information of stereoscopic video. At step 50 c, the stereoscopicvideo arrangement information is read. At step 50 d, on the basis of thestereoscopic arrangement information being read in, when displaying thecontents list in the disk, marking of stereoscopic display is shown ineach content on the menu screen. In this way, the user can recognize thepresence of stereoscopic video. This information, if there is only onein the entire optical disk, may be included in the navigationinformation in each data unit of DVD.

[0087] At step 50 e, data of specific address is reproduced, and at step50 f, referring to stereoscopic video arrangement information, it isjudged whether the data is stereoscopic video or not. If Yes, at step 50g, from the data of stereoscopic video arrangement information, forexample, when the first time domain 46 is R signal and second timedomain 47 is L signal, each signal is decoded, the data of the firsttime domain 46 is issued as the image for the right eye, and the data ofthe second time domain 47 is issued as the image for the left eye. Theseimages are synchronized. When reproducing the next data, returning tosteps 50 e, 50 f, it is checked whether stereoscopic video or not. Ifnot stereoscopic video, advancing to step 50 h, for example, the data ofeither the first time domain 46 or the second time domain 47 is issuedin the same image as the image for the right eye and the image for theleft eye. It hence prevents output of images of different contents inthe right and left eyes.

[0088] In the invention, the reproducing procedure is different betweenwhen reproducing ordinary videos of interleaved block system, and whenreproducing stereoscopic videos of interleaved block system. Features ofthe invention are described below.

[0089] As shown in the recorded data on the optical disk in the timechart (1) in FIG. 14, A1 data and the beginning address a5 of the firstinterleaved block 56 a to be accessed next are recorded in the firstinterleaved block 56. That is, since the next pointer 60 is recorded, asshown in FIG. 14(2), when reproduction of the first interleaved block 56is over, only by accessing the address of the pointer 60 a, by jumpingtracks, a next first interleaved block 56 a is accessed in 100 msec, sothat A2 data can be reproduced. Similarly, A3 data is reproduced. Thus,contents A3 can be reproduced continuously.

[0090] By contrast, in the optical disk recording R and L stereoscopicvideos shown in FIG. 14(3), in order to keep compatibility, the samepointer 60 is included so as to make into same format as in FIG. 14(1).Accordingly, the stereoscopic video cannot be reproduced unless thepointer is ignored. From the stereoscopic video logic arrangement table,moreover, the stereoscopic identifier 61 of each cell can be defined.Accordingly, the stereoscopic identifier 61 of the interleaved blocks54, 55, 56, 57 can be logically defined. This is shown in the diagram.To reproduce R2 and L2 by reproducing R1 and L1 and jumping, the pointercannot be used directly. More specifically, after completion ofreproduction of R interleaved block 54, instead of accessing the addressof pointer a5, next L interleaved block 55 is reproduced, and pointer a5of R interleaved block is accessed by jumping tracks. In this case,pointer 60 b of L interleaved block 55 is ignored. When reproducing aninterleaved block of which stereoscopic identifier is 1, by changing theaccess procedure of pointer address from that in ordinary video, itprovides an effect of reproducing R and L continuously as shown in FIG.14(4).

[0091] Referring to the flow chart in FIGS. 15 and 16, the procedure forchanging the pointer when accessing the interleaved block is describedby using the stereoscopic video identification information.

[0092] First, at step 62 a, an access command for an address of aspecific cell is produced. At step 62 b, the address to be accessed isjudged to be stereoscopic video or not by referring to the stereoscopicvideo arrangement information. At step 62 c, if not stereoscopic video,skipping to step 62 t, one process of ordinary video is carried out. Ifstereoscopic video at step 62 c, advancing to step 62 d, it is checkedwhether or not to reproduce the stereoscopic video of the user or thelike, and if No, the display of “stereoscopic video” is shown on thescreen, and the process skips to step 62 t.

[0093] If Yes at step 62 d, the stereoscopic video arrangementinformation is read out at step 62 e, and the arrangement of R and Linterleaved blocks is calculated from the chapter number, R cell number,L cell number, etc. At step 62 g, an n-th R interleaved block isreproduced, and at step 62 h, pointers recorded in R interleaved blockand L interleaved block are read out, and stored in the pointer memory.At step 62 i, the previous, that is, (n−1)-th pointer AL (n) is readoutfrom the pointer memory. At step 62 j, it is checked if AL (n) and AR(n) are continuous or not, and if No, the tracks are jumped to addressAL (n) at step 62 k.

[0094] Next, in FIG. 16, at step 62 m, an n-th L interleaved block isreproduced, and at step 62 n, the pointer address of n+1 is reproduced.At step 62 p, it is checked if reproduction of all data is complete ornot. At step 62 q, it is checked whether the n-th L interleaved blockand (n+1)-th R interleaved block are recorded continuously or not, andif not continuous, at step 62 r, the tracks are jumped to AR (n+1) toreturn to step 62 f. If Yes, the process returns to step 62 f.

[0095] At step 62 t, if stereoscopic video is not displayed, startaddress A (1) of h cell is accessed, and the first interleaved block isreproduced, and at next step 62 u, the n-th interleaved block of addressAn (n) is reproduced sequentially. At this time, in each interleavedblock, jumping tracks to the next interleaved block, the pointer addressA (n+1) for accessing is read out at step 62 v, and it is checkedwhether data reproduction is complete or not at step 62 w, and ifcomplete, the process returns to the first step 62 a of flowchart A. Ifnot complete, at step 62 x, it is checked whether interleaved blockshaving start addresses of A (n) and A (n+1) are continuous or not, andif Yes, without jumping, the process returns to the step before step 62u. If No, at step 62 y, the tracks are jumped to address A (n+1).

[0096] Next, by referring to the block diagram of reproducing device for720P reproduction of double speed progressive or super-wide screen shownin FIG. 20, the reproduction operation of a reproducing device 65 of theinvention is specifically described below. The signal reproduced fromthe optical disk 1 is separated by a separating unit 68 into a firstinterleaved block 66 and a second interleaved block 67 composed of framesignals of one GOP or more each. Frame video signals 70 a, 70 b of 30seconds expanded by MPEG in an expanding unit 69 are separated into oddfield signals 72 a, 72 b and even field signal 73 a, 73 b in fieldseparating units 71 a, 71 b, and interlace signals 74 a, 74 b of 2chNTSC are issued. The wide screen in FIG. 20 is described later Referringto FIG. 22, the encoding operation of progressive video signal isdescribed below. At t=t1 and t2, progressive video signals 75 a, 75 bare entered, and signals of t1 and t2 are combined in a combining unit76, and a combined signal 77 is obtained. The combined signal 77 istaken out zigzag in the separating unit 78, and odd interlace signals 79a, 79 b and even interlace signals 80 a, 80 b are produced. By combiningthe odd interlace signals 79 a, 79 b and even interlace signals 80 a, 80b, frame signals 81 a, 81 b are obtained. Segmenting one GOP or moreGOPs which is consist of 10 to 15 frames of compressed signals 83 a, 83b compressed in MPEG compressing units 82 a, 82 b, interleaved blocks 84a, 84 b, 84 c are produced, and same time stamps are added to thecompressed signals separated from the same progressive signal by timestamp providing means, and the signals are recorded on an optical disk85.

[0097] The optical disk 85 containing the progressive signal isreproduced in a double speed reproducing device 86 in FIG. 21, andreproduced in interleaved block units in a separating unit 87, andseparated into two streams of interleaved blocks 84 a, 84 c, andinterleaved block 84 b, then expanded into frame signals 89 a, 89 b of720×480 pixels in expanding units 88 a, 88 b. In field separating units71 a, 71 b, the signals are separated into odd fields 72 a, 72 b andeven fields 73 a, 73 b on the time axis. So far, the operation is sameas in the reproducing device 65 in FIG. 20.

[0098] In FIG. 21, however, odd fields 72 a, 72 b of channel A 91 andchannel B 92 are combined in a combining unit 90. Even fields 73 a, 73 bare similarly combined. Thus, channel A 91 and channel B 92 are combinedzigzag, and progressive signals 93 a, 93 b of 60 frames/sec areobtained, and delivered from a progressive video output unit 94.

[0099] Thus, according to the reproducing device of the invention,progressive signals, that is, 525 signals not interlacing NTSC signals,or 480 signals in this case are obtained. A reproducing unit 95reproduces at double speed.

[0100] In this case, if the conventional optical disk recording moviesoftware is reproduced, a progressive video is obtained.

[0101] In FIG. 20, meanwhile, when reproducing the optical diskcontaining the movie software for single speed reproducing device forreproducing interlace signals, since the movie software is composed offrame signals (progressive signals) of 24 frames per second, 24 framesof progressive signals are obtained in the MPEG decoder. By detectingthe movie software by detecting means, or by transforming 24 frames intoprogressive signals of 60 frames/sec in a 3-2 transforming unit 174shown in FIG. 20, progressive signals are reproduced. In the case ofinterlace output, by filtering the progressive signals in a verticalfilter unit by referring to the filter identifier, an interlace videofree from disturbance is obtained.

[0102] Herein, when the optical disk 85 encoded in FIG. 22 is reproducedin the reproducing device 65 applicable to progressive signals in FIG.20, an interlace signal 74 a of channel A is reproduced. A conventionalDVD player of interlace type has channel A only out of channel A andchannel B. Hence, when the optical disk 85 of the invention is loaded ina conventional DVD player of interlace type, it is known that theinterlace signal of channel A is obtained. That is, in the optical diskof the invention, progressive signals are obtained in the reproducingdevice of the invention, and interlace signals of the same contents areobtained in a conventional reproducing device, and a perfectcompatibility is realized.

[0103] In this case, by adding an interlace interference removingcompressing filter 140 to the MPEG encoder in FIG. 22, although thefrequency characteristic is slightly lowered, aliasing distortionbetween channel A and channel B can be decreased.

[0104] Encoding of stereoscopic video is more specifically describedbelow.

[0105] As shown in FIG. 23, a right-eye signal 97 and a left-eye signal98 are entered in a recording device 99. Being of interlace signals, inevery {fraction (1/60)} second, odd field signals 72 a, 72 b and evenfield signals 73 a, 73 b are entered. The signals are combined incombining units 101 a, 101 b, and transformed into frame signals 102 a,102 b in every {fraction (1/30)} second. Compressed signals 83 a, 83 bcompressed in compressing units 103 a, 103 b are gathered into a set ofone GOP or more, and interleaved block 84 a, 84 b, 84 c are produced,and are arranged alternately and recorded on the optical disk 1. Whenthis optical disk 1 is reproduced in the reproducing device of theinvention shown in FIG. 24, the stereoscopic/PG video arrangementinformation reproducing unit 26 in FIG. 5 detects the PG identifier inthe disk, and the reproducing device 104 is established in thestereoscopic reproducing mode as shown in the block diagram in FIG. 24.In this case, the stereoscopic video in the optical disk 1 d is firstseparated into channel A and channel B in the separator 68, and expandedin expanding units 88 a, 88 b, and separated into field signals in fieldseparators 71 a, 71 b. So far, the operation is same as in FIG. 21.

[0106] It is a feature of FIG. 24 that the field separator 71 a issuesodd field signals and even field signals by changing over the outputsequence in an output converting unit. First, for progressive TV, thatis, for TV of field frequency of 120 Hz, odd field signal 72 a ofchannel A, odd field signal 72 b of channel B, even field signal 73 a ofchannel A and even field signal 73 b of channel B are sent outsequentially. As a result, odd fields and even fields are issuedsequentially and alternately to the right and left eyes, and thereby byusing switch type stereoscopic goggles, a flicker-less video matched intime information is obtained from the progressive output unit 105.

[0107] As the output to the general TV, by using the odd field 72 a ofchannel A and even field 73 b of channel B out of the above from theNTSC output unit 106, although flicker is present, a stereoscopic videoof natural motion is obtained through stereoscopic goggles.

[0108] When the progressive system of the invention and the stereoscopicvideo reproducing system are combined, stereoscopic videos of highpicture quality of right and left progressive images are obtained. Thisis explained in FIG. 25. This reproducing device 107 reproduces at afour-speed rate, and hence requires a four-speed reproduction capacity.In the DVD, however, it may be 80% of ordinary transfer rate. If, asshown in FIG. 25, when interleaved blocks 108 a, 108 b, 108 c, 108 d ofright progressive signals A, B and left progressive signals C, D arearranged continuously without gap, the optical pickup can reproducecontinuously without jumping tracks. In the case of DVD, since theinformation is limited to 80%, in continuous reproduction, instead offour speed, 3.2 speed is enough. Such continuous arrangement bringsabout an effect of reducing the reproducing speed.

[0109] Back to the explanation, by a separator 109, the interleavedblocks 108 a, 108 b, 108 c, 108 d are separated as mentioned above, andsignals of four channels A, B, C, D are reproduced. Video signalsexpanded in expanding units 69 a, 69 b, 69 c, 69 d are combined incombining units 90 a, 90 b same as in FIG. 21, and two progressivesignals are issued from progressive output units 110 a, 110 b. They arerespectively left-eye signal and right-eye signal, and a progressivestereoscopic video is issued from the reproducing device 107. In thiscase, by using four-speed block MPEG chip, it is possible to process byone chip, and hence the number of parts is not increased. It is alsopossible to record and reproduce four videos of different contents. Inthis case, four screens of multi-screen TV can be displayedsimultaneously by one disk.

[0110] It is also a feature of the invention that the compatibility isguaranteed in all cases. When the disk 106 in FIG. 25 is reproduced in aconventional DVD or other reproducing device, the interlace signal foreither the right eye or the left eye is issued. The picture quality isnot deteriorated. However, only ¼ of time can be reproduced. By adheringtwo layers of DVD, the total time is 2 hours and 15 minutes, and it isenough for almost all movies.

[0111] In the reproducing device of the invention applicable todouble-speed stereoscopic/progressive video, when the user sends acommand to the control unit 21 through the channel selection unit 20from the input unit 19 in FIG. 9, the stereoscopic interlace orone-channel progressive video can be changed over to a desired video.Thus, like the monaural record and stereo record in the past, a completecompatibility is assured.

[0112] Accordingly, by the double-speed or four-speed reproducing deviceof the invention, videos of various picture qualities and projectionmethods may be obtained.

[0113] In the invention, therefore, in the absence of stereoscopic videoidentifier, it is enough to read the pointer and jump, and in thepresence of stereoscopic video identifier, by reading the pointer of oneof the interleaved blocks of one step before, and changing thereproducing procedure to access, the stereoscopic video can be recordedwithout changing the format.

[0114] Herein, a method of dividing the screen of scope size movie intotwo images, and recording and reproducing is described below.

[0115] In FIG. 20, the method of reproducing the optical disk 1recording two screens of interlace signals by a double-speed reproducingdevice of the invention was mentioned. In FIG. 40, by applying thismethod, a superwide image 154 of scope size (2.35:1) is divided in ascreen dividing unit 155 into three screens, that is, a central image156 and side images 157, 158, and the dividing position is indicated bya center shift quantity 159. The central image 156 d is supposed to be afirst video signal 156 d, and is compressed as a second video signaltogether with side images 157 d, 158 d, and interleaved in aninterleaved unit 113, and recorded in the optical disk together with thecenter shift quantity 159. In this case, since the second video signalis a patched-up picture of different qualities, and it is not preferredto be reproduced. Accordingly, by a second video signal limitinginformation adding unit 179, password protection or other reproductionlimiting information is added to the stream of the second video signalin the file control information region of the optical disk. As a result,in the reproducing device, the second video signal is not reproducedindependently. Thus the viewer can be protected from viewing theabnormal image of independent output limit division screen of secondvideo signal. In this case, in the progressive applicable player, bothfirst video signal and second video signal are reproduced, and a widescreen can be issued.

[0116] When this disk is reproduced in the reproducing device in FIG.20, first of all, the second video signal is not issued independently.From the optical disk, the center shift quantity 159 is reproduced fromthe center shift quantity reproducing unit 159 b. By using this shiftquantity 159, in a wide screen combining unit 173, the scope image iscombined, and it is transformed by 3-2 pull-down in a 3-2 transformingunit 174 as shown in FIG. 41, and 24 frames of the movie are transformedinto interlace signals of 60 fields/sec, or progressive signals of 60frames/sec. As, shown in FIG. 41, expansion and wide screen combinationare effected. In the process of 3-2 transformation in the 3-2transforming unit 174, a combined image 179 a of a combined image 179comprising 24 frames per second is separated into three interlace images180 a, 180 b, 180 c, and a combined image 179 b is separated into twointerlace images 180 d, 180 e. Thus, the image of 24 frames/sec istransformed into an interlace image of 60 fields. In the case of outputof progressive image 181, the three progressive images 181 a, 181 b, 181c and two progressive images 181 d, 181 e may be issued directly.

[0117] As a second method of separating the screen, as shown in FIG. 40,when a screen 154 of 1440×480 pixels is separated in an image horizontaldirection separator 207 to separate two pixels in the horizontaldirection into one pixel each, it is separated into two horizontalseparate screens 190 a, 190 b of 720×480 pixels each. By a similartechnique, they are compressed as a first video signal and a secondvideo signal, and recorded in an optical disk 191. In this case,aliasing distortion occurs in the horizontal direction, and two pixelsare added at a specific addition ratio by a horizontal filter 206 toattenuate the high frequency components in the horizontal direction asshown in the horizontal filter 206 in FIG. 46. This prevents moire atthe time of reproduction with 720 dots in the existing reproducingdevice.

[0118] When this optical disk 191 is reproduced in the reproducingdevice 65 in FIG. 20, the horizontal separate screens 190 a, 190 b aredecoded, and when combined in the wide image combining unit 173, theoriginal screen 154 a of 1440×480 pixels is reproduced. In the case ofthe movie software, for 3-2 transformation, as shown in FIG. 41, thescreen 154 a is combined to transform by 3-2.

[0119] In this second screen horizontal separating method, in both firstvideo signal and second video signal, since an ordinary picture of720×480 pixels dividing the original 1440×480 pixels into half in thehorizontal direction is recorded, if the second video signal isreproduced by mistake in the ordinary reproducing device such as DVDplayer, since the picture of the same aspect ratio as in the original isdelivered, the compatibility is high. Thus, by this separating method,the interlace image is reproduced in an ordinary reproducing device, 525progressive image in an applicable reproducing device, and a wide imagesuch as 720P scope in a 720P high resolution applicable reproducingdevice. The movie material can be reproduced at double speed, and hencethe effect is high.

[0120] Further developing this technique, in FIG. 44, a progressiveimage 182 a of 1440×960 is separated into the horizontal or verticaldirection by a horizontal or vertical separator 194 of the imageseparator 115 by using, for example, sub-band filter or wavelettransform. As a result, a 525 progressive image 183 is obtained. It isseparated into 525 interlace signal 184, and recorded in a stream 188 a.

[0121] On the other hand, the remaining interpolating information 185 issimilarly separated into four streams 188 c, 188 d, 188 e, 188 f, andrecorded in interleaved blocks. The maximum transfer rate of eachinterleaved block is 8 Mbps in DVD standard, and when the interpolatinginformation is divided into four steams, it is 32 Mbps, and in the caseof six angles, 48 Mbps is recorded, so that 720P and 1050P HDTV videoscan be recorded. In this case, in the conventional reproducing device,the stream 188 a is reproduced, and the interlace video 184 is issued.In the streams 188 c, 188 d, 188 e, 188 f, since the output limitinginformation is recorded in the optical disk 187 by an image processinglimiting information generating unit 179, so that the interpolatinginformation 185 of poor picture quality such as differential informationwill not be issued by mistake. Thus, by separating in both horizontaland vertical directions by the method in FIG. 44, a compatible opticaldisk applicable to both HDTV and NTSC is realized.

[0122] In FIG. 20, the interlace signal is transformed in an interlacetransforming unit 175, and issued and a scope screen 178 is obtained.The 525P progressive signal is similarly issued as the scope screen 178.When observing with a monitor of 720P, the 525P signal is transformedinto a 720 progressive signal in a 525P/720P transforming unit 176, anda letterbox type 720P screen 177 of 1280×720 or 1440×720 (the image sizebeing 1280×480 or 1440×480) is issued. Since the scope screen (2.35:1)is 1128×480 wide, an image of a closer aspect ratio is obtained. Inparticular, in the case of movie software, because of 24 frames/sec, theprogressive image is at a rate of 4 Mbps. When the scope video isrecorded in the system of the invention of dividing into two screens,the rate is 8 Mbps, and since the recording time is about 2 hours ontwo-layer disk of DVD, so that a scope video of 720P or a progressivevideo of high picture quality of 525P can be recorded in one disk. Inthe conventional TV, too, the interlace output signal is displayed. Itis hence effective to issue the scope screen (2.33:1) of movie at 525Por 720P.

[0123] Herein, referring to FIG. 51, a method of recording andreproducing 1050 interlace signals is specifically described below. Aneven field 208 a of 1050 interlace signals is separated into two images208 b, 208 c by horizontal separating means 209, and separated intoimages 208 d, 208 e by vertical separating means 210 a, 210 b, andimages 208 f, 208 g are similarly obtained. An odd field signal 211 a issimilarly separated, and images 211 d, e, f, g are obtained. In thiscase, the image 208 d and image 211 d are main signals, and the DVDinterlace video is obtained in a conventional reproducing device. Toprevent interlace interference, horizontal filters 206 b, 206 c, andvertical filters 212 a, 212 b are inserted, so that aliasing distortionof reproduced image is decreased.

[0124] Referring to FIG. 27, FIG. 28, FIG. 42, and FIG. 49, the filestructure and video identifier are described. FIG. 27 shows the DVDlogic format. Video files are recorded in logic blocks. As shown in FIG.28, the minimum unit in the system stream is called a cell, in which, asshown in FIG. 42, video data and audio data in one GOP unit, andsub-picture are recorded in a packet.

[0125] The provider defined stream in a packet 217 in a cell 216 (seeFIG. 49) of main signal of the first stream has a capacity of 2048bytes. It includes recording of a progressive identifier 218 showingwhether progressive or interlace, a resolution identifier 219 showingwhether the resolution is 525, 720 or 1050, a differential identifier220 showing whether the interpolating signal is a differential signalfrom the main signal, a filter identifier 144 described below, and asub-stream number information 221 showing the stream number of a firstsub-stream.

[0126] By reference to FIG. 52, the procedure of reproducing by a videoidentifier 222 is described below.

[0127] From the optical disk, first, reproducing procedure controlinformation 225 is read out from management information 224. Since thelimiting information of VOB (Video Object) is included herein, in theexisting reproducing device, it is connected only from No. 0 VOB 226 ato No. 1 VOB 226 b in which the main video is recorded. Since No. 0 VOB226 a is not connected to No. 2 VOB 226 c in which the interpolatingsignal of differential information or the like is recorded, video ofpoor picture quality will not be reproduced from the conventionalreproducing apparatus such as the differential information as mentionedabove. A video identifier is recorded in each VOB of the main signal,and since No. 1 VOB 226 b and No. 2 VOB 226 c are progressiveidentifier=1, resolution identifier=00 (525 signals), 525 progressivesignals are reproduced from the progressive player or HD player.

[0128] Since the video identifier 222 of the next VOB 226 d is theprogressive identifier=0 and resolution identifier 219=10, there are1050 interlace signals, and it is known that three VOBs, VOB 226 e, VOB226 f, VOB 226 g, are interpolating information. Thus, in theconventional players, 1050 interlace signals with 720 horizontal pixelsare issued by the NTSC progressive player, and 1050c full standard HDTVsignals are issued by HD player. Thus, by the video identifier 222,various video signals can be recorded and reproduced in interleave. Thevideo identifier 222 may be also recorded in the management information224.

[0129] Herein, referring to FIG. 53, VPTS (video presentation timestamp) of sub-track by each interleaved block, that is, the timerelation in decoding output is described. In No. 1 VOB 226 b,interleaved blocks 227 a, 227 b, 227 c of main signal are recordedtogether with VPTS1, 2, 3 of VPTS. In No. 2 VOB 226 c, interleavedblocks 227 d, 227 e, 227 f are recorded together with VPTS1, 2, 3. Theconventional player reproduces the interleaved blocks 227 a, 227 b, 227c at single speed. Since sound is also included in the main signal, thesound is also reproduced. On the other hand, in the progressiveapplicable player, the interleaved block 227 d of No. 2 VOB 227 c assub-signal is reproduced, and stored once in the buffer memory. Whenstored completely, the interleaved block 227 a of No. 1 VOB 226 b of themain signal is reproduced, and the AV synchronism is achieved by thissynchronous information. Since the sound is also recorded in the mainsignal, the output of the main signal and sub-signal as shown in FIGS.53(2), (3) is synchronized with sound. In this case, tracks are jumpedbetween the interleaved block 227 a and interleaved block 227 e. Thus,the progressive signal in FIG. 53(4) is issued. In this way, at thereproducing device side, by checking the same VPTS of each interleavedblock, the main signal and sub-signal are decoded synchronously andcombined, so that a normal progressive signal is maintained.

[0130]FIG. 54 is a diagram showing an arrangement of signals ofsimul-casting system for interleaved recording of NTSC signal and HDTVsignal individually, independently, and at the same time. In this case,NTSC video and sound 232 are recorded in the main signal of VOB 227 a.In VOB 227 b, VOB 227 c, a signal of about 16 Mbps of compressed videosignal of HDTV is divided into 8 Mbps each, and recorded on the opticaldisk in the interleave system of the invention. In the conventionalplayer in FIGS. 54(1), (2), and in the progressive applicable player,(525i) signal of NTSC is reproduced. However, in the HDTV player in FIG.54(3), only the audio data is obtained from No. 1 VOB 227 a, and firstsub-video and second sub-video are reproduced from the VOB 227 b, 227 c,and combined, and the HDTV signal of 16 Mbps is reproduced as shown inFIG. 54(3). In this case, since the reproduction of sub-signal islimited by reproducing procedure limiting information 225, in the eventof misoperation of the existing DVD player by the user, the HDTVcompressed signal will not be reproduced. Thus, the NTSC is issued fromthe conventional player, and HDTV signal, from the HDTV splay, so thatthe compatibility is maintained. A block diagram is shown in FIG. 55.The detail of operation is same as above and is omitted, and thereproduced signal from the optical disk is separated by an interleavedblock separator 233, and the sound of the main signal is decoded by anaudio decoder 230 of NTSC decoder 229, the stream of 8 Mbps of firstsub-signal and second sub-signal is decoded in HDTV decoder 231, and theHDTV signal is decoded. In this way, HDTV signal and audio signal areissued. In this case, by simul-casting, in the firsts place, it ispossible to reproduce in NTSC also by a conventional machine. In theinvention, by using two interleave streams, a transfer rate of 16 Mbpsis obtained, and the MPEG compressed signal of standard HDTV can bedirectly recorded. Next, in the DVD, only 16 Mbps can be recorded in twointerleaved blocks. On the other hand, the HDTV compressed video signalis 16 Mbps. Accordingly, audio data cannot be recorded. However, as inthe invention, by making use of the audio data of NTSC signal of mainsignal, if the HDTV is recorded in two interleaves, the audio output canbe recorded.

[0131] Herein, a method of removing interlace interference is describedbelow. When a progressive signal is decimated and transformed intointerlace signal, aliasing occurs, and moire of low frequency componentoccurs. At the same time, line flicker of 30 Hz occurs. To avoid this,it is required to pass through interlace interference removing means.The interlace interference removing means 140 is put into theprogressive signal block of the progressive interlace transforming unit139 in the block diagram of the recording device 99 in FIG. 22 explainedabove. From the entered progressive signal, first, the video signal ofhigh probability of occurrence of interlace interference is detectedfrom the interlace interference image detecting means 140 a, and onlythis video signal is passed into the interlace interference removingfilter 141. For example, in the case of the image of low frequencycomponent in the vertical direction, since interlace interference doesnot occur, the filter is circulated through a filter bypass route 143.Accordingly, deterioration of vertical resolution of image can belessened. The interlace interference removing filter 141 is composed ofa vertical direction filter 142.

[0132] As shown in the time and space frequency diagram in FIG. 46(a),the shaded area is an interlace aliasing distortion occurring region213. To remove this, it may be passed through a vertical filter. Morespecifically, as shown in FIG. 46(c), installing three line memories195, of 480 progressive line signals, by adding the video information ofthe objective line (n-th line), and video information of the linesbefore and after ((n−1)-th, (n+1)-th lines), three in total, by an adder196 at an addition ratio, video information of one line is obtained, and240 interlace signals are produced. By this processing, the verticaldirection is filtered, and the interlace interference is alleviated. Byvarying the addition ratio of three lines, the filter characteristicscan be changed. This is called the vertical three-line tap filter. Byvarying the addition ratio of a line and the preceding and followinglines, a simpler vertical filter is obtained. As shown in FIG. 46(d),the line information is not a simple vertical filter, but, verticalfiltering may be executed by developing, for example, even lines of the(n−1)-the line of previous frame and (n+1)-th line of next frame on asame space. By this timevertical filter 214, it is effective to lessenthe interlace interference occurring when viewing only the interlacesignal by reproducing the optical disk recording the progressive signalby a DVD player not applicable to progressive video. A horizontal filter206 a is realized by adding two pixels in the horizontal direction, andcombining into one pixel. By filtering, however, the resolution of theprogressive video is deteriorated. By the interlace interference videodetecting means 140, by not filtering the image small in interference orchanging the addition ratio of the adder of the vertical filter, thefiltering effect is weakened, and it is effective to lessendeterioration in reproduction of progressive video. In the reproducingdevice applicable to progressive video of the invention, if not filteredduring recording as mentioned later, the interlace interference can beremoved by the filter at the reproducing device side. In future, it willbe replaced by the progressive applicable type reproducing device,filter is not necessary when recording in future. In this case, filteredoptical disk and non-filtered optical disk are present, and theinterlace interference detecting means 140 issues an interlaceinterference removal filtering identifier 144 to the filtered image asan identifier for identifying it, and records it on the optical disk 85by the recording means 9.

[0133] A specific recording method of filter identifier shown in FIG. 50is described. A filter identifier 144 is put into a header in a GOPwhich is a pixel unit of MPEG in a stream. “00” means there is nofilter, “10” shows a signal passing through a vertical filter, “01”through a horizontal filter, and “11” through a vertical or horizontalfilter. Being entered in the minimum unit of one GOP, the filter can beturned on and off in every GOP in the reproducing device, so thatdeterioration of picture quality due to double filters is prevented.

[0134] The operation of reproducing this optical disk 85 by thereproducing device 86 a is described by referring to FIGS. 32(a), (b).Same as in FIG. 21, two interlace images 84 a, 84 b are reproduced, andonce combined into a progressive image 93 a. However, when the interlaceinterference removal filtering identifier 144 is ON or when notperforming trick play such as slow or still picture and not issuingprogressive image, the interlace signal is issued directly by interlaceoutput 145 by single speed rotation. In this case, energy-saving effectis obtained.

[0135] In the case of trick play or when the interlace interferenceremoval filtering identifier 144 is OFF, a double speed command 146 issent to a motor rotating speed changing unit 35 from a control unit 147,and the optical disk 85 rotates at double speed, and the progressivevideo is reproduced.

[0136] When issuing thus reproduced progressive video to an interlace TV148 as an interlace signal, a method of removing the interlaceinterference is described below. When the interlace interference removalfiltering identifier 144 is OFF, a judgement changeover circuit 149 ischanged over, and the progressive signal is passed into the interlaceinterference removal filter 141, and odd interlace signal 72 a and eveninterlace signal 73 a are issued from two frames 93 a, 93 b in theinterlace changing unit 139, and an ordinary interlace signal is issued.In this case, an image free from interlace interference is displayed inthe interlace TV 148. Since the effect of interlace interference filteron the interlace signal is small, the interlace signal does notdeteriorate. On the other hand, in a progressive signal output unit 215,a progressive signal free from interlace interference removal filter isissued. Therefore, by the on/off method of interlace interferenceremoval filter at the reproducing device side, outputs of progressivevideo free from deterioration and interlace video free fromdeterioration such as interlace interference are obtained at the sametime, which is a very notable effect.

[0137] In slow reproduction of ½ or lower speed or still picturereproduction, the interlace interference decreases, and the removalfilter is weakened.

[0138] Means for improving picture quality in trick play is describedbelow. When a command for slow or still picture reproduction is put intoslow still picture reproducing means 151 from a control unit 147 throughan operation input unit 150, the interlace transforming unit 149distributes 480 lines of one frame 93 a into two fields by the frameprocessing unit 152, and an odd interlace signal 72 b and an eveninterlace signal 73 b are produced and issued. As a result, an interlacestill picture or slow reproduction image of resolution of 480 lines freefrom shake is displayed in the interlace TV 148. In the conventionalinterlace type reproducing device, to obtain a still picture or slowpicture free from shake, the resolution must be lowered to 240 lines,but in this invention, by once transforming from the interlace to theprogressive video, and then transforming to the interlace video, it iseffective to obtain slow and still picture of interlace at resolution of480 lines. In FIG. 32(a), steps 153 a to 153 g show this procedure inflow chart, but detailed description is omitted.

[0139] Next, in the method shown in FIG. 26, from a stream of twochannels, for example, from a disk interleaving videos of camera 1 andcamera 2, a first stream is reproduced, and it is changed over to asecond stream intermediately, and issued continuously.

[0140] Referring to FIG. 35, when the contents have plural stories, thatis, streams are multiplexed, a method of changing over from a specificstream to other stream smoothly without interruption is described. Asshown in FIG. 35(1), two different stories are recorded in an opticaldisk 106, as two streams of first video signal and second video signal,that is, first stream 111 and second stream 112, basically on the sameradius, approximately.

[0141] In this case, since only the first video signal as basic story isreproduced usually, after the first stream 111 a, a next first stream 11b is reproduced and issued consecutively. However, at the moment oft=tc, when the user commands to change over to the second video signalfrom the command input unit 19 in FIG. 5, at t=tc, the track at otherradius position is accessed by using the tracking control circuit 22 inFIG. 5 from the first stream 111 a to the second stream 112 b, and theoutput signal is changed over to the second stream 112 b of the secondvideo signal.

[0142] Thus, when the first video signal is at the time of t=tc in FIG.35(2), the picture, sound and sub-picture of the second video signal arechanged over smoothly without interruption.

[0143] A method of seamless reproduction by synchronizing the picture,sound and sub-picture is described below.

[0144] Referring to the timing chart in FIGS. 35(3), (4), the datareproducing procedure is more specifically described below. As explainedin the block diagram of the recording device in FIG. 22, the progressivevideo of the first video signal is separated into main interlace videosignals A1 to An of Odd-line First, and sub-interlace video signals B1to Bn of Even-line First, and recorded separately in first angle andsecond angle sub-channels, respectively. Although omitted in FIG. 22,the progressive video of the second video signal is similarly separatedinto main interlace video signals C1 to Cn and sub-interlace videosignals D1 to Dn, and recorded separately in third angle and fourthangle as shown in FIG. 35(3). FIG. 35(3) is an explanation of theprinciple of FIG. 36 in time chart, and the operation is the same.

[0145]FIG. 36 explains the recording device in FIG. 22, limiting only tothe interleave unit. The progressive signals of the first video signalare separated into two interlace signals, that is, odd-first main signaland even-first sub-signal, in the first video signal separator 78 a. Inthis case, in order to decrease the quantity of information, adifferential signal of main signal and sub-signal is determined in adifferential unit 116 a, and the main signal and differential signal arecompressed and recorded in the disk, so that the recording informationquantity can be decreased. In the case of progressive video, since thecorrelation of adjacent odd line and even line is very close, theinformation quantity of differential signal between the two is small. Bycalculating the difference, it is effective to reduce the informationquantity substantially.

[0146] In the divided recording method of the invention using thisdifferential unit 116 a, as shown in FIG. 44, a 720P or 720-lineprogress signal 182 or 1050P progressive video 182 a are separated into525. basic information 187, progressive video 183, 525 interlace video184 and complementary information 186 by the image separator 115. By thedifferential unit 116 a, basic information 187 and differentialinformation 185 of complementary information 186 are determined, andthis differential information 185 can be separated into four streams 188c, 188 d, 188 e, 188 f in total by the second video signal separator 78c and third video signal separator 78 d. Sending them to the compressingunit 103, and interleaving with the interleave 113 a, six streams arerecorded in each angle of the optical disk 187.

[0147] At this time, since the streams 188 c, 188 d, 188 e, 188 f aredifferential information or complementary information, if decoded in thereproducing device, when issued to the TV screen, since it is not anormal TV picture, it gives an impression of discomfort to the viewer.In the invention, accordingly, in order that the angle of the streams188 c, 188 d, 188 e, 188 f including the complementary information maynot be issued in the past non-applicable reproducing device, thelimiting information is generated in a video output limiting informationgenerating unit 179, and recorded in the optical disk 187. Morespecifically, in the DVD standard, it is designated so as not to openthe specific stream without password. By protecting the streams 188 dc,188 d, 188 e, 188 f with password, it cannot be opened easily in theconventional reproducing device, thereby avoiding presentation ofabnormal picture decoding the complementary information 186 by mistaketo the viewer.

[0148] Back to FIG. 36, the first video signal is thus compressed, andthe main signal becomes interleaved blocks 83 a, 83 c of A1, A2 in theunit of one GOP or more. On the other hand, the main signal of thesecond video signal is the interleaved block 83 g of C1, C2, thesub-signal is the interleaved blocks 83 b, 83 d of B1, B2, and thesub-signal is the interleaved blocks 83 f, 83 h of D1, D2. From thesefour sets of data, as shown in FIG. 36, a recording stream 117 isgenerated. In the recording stream 117, the data are arranged in thesequence of A1, B1, C1, D1, A2, B2, C2, D2, and recorded on an opticaldisk 155 by recording means 118. Seeing at the progressive signal level,A1, B1, A2, B2 are first video signals, and hence the data are recordedin the sequence of the first video signal, second video signal, firstvideo signal, second video signal and so forth. Seamless interruption ofAV synchronous control unit is described later.

[0149] In the above explanation, MPEG signals of one GOP or more arerecorded in each interleaved block, and strictly speaking, since oneinterleaved block is limited to about 0.5 sec or less, the video signalscan be recorded for the portion of 30 fields at maximum. Therefore, atmaximum, 30 GOPs can be recorded in one interleaved block. That is, oneinterleaved block of the invention is limited to recording of one GOP ormore and up to 30 GOPs or less.

[0150] When recording on a DVD, normal reproduction is not obtainedunless the DVD standard is satisfied. In the DVD standard, each chapter,that is, each VOB must start with Odd-line First. When the progressivesignal of the invention is separated, as shown in FIG. 22, the interlacesignal is main, and the signal is an odd line, that is, Odd-line First,but the sub-signal is an even line, that is, Even-line First.Accordingly, in the invention, as shown in FIG. 33, the progressivevideos 75 a, 75 b are separated by the separator 78, into a field pairof odd interlace signal 79 a and even interlace signal 80 a as the mainsignal, and into even interlace signal 80 b and odd interlace signal 79b as the sub signal. The first VOB 118 composed of main signal startswith the odd interlace signal 79 a of odd line field, and hence noproblem is caused. However, the sub-signal starts with even interlacesignal 80 b composed of even line, and it is not normally reproduced inthis state. In the invention, by dummy field generating means 120, atleast one dummy field 121 is created, and the dummy field 121 is addedto the beginning of the second VOB 119 by dummy field adding means 122.The dummy field 121 is reproduced continuously later. Unnatural feelingmay be eliminated when reproducing by copying the image of the eveninterlace signal 80 b or field picture of odd interlace signal 79 b.

[0151] A compressing method is described below. Interlace signals 79 a,80 a of the first VOB 118 are assembled into a field pair 125 a, andcoded in a frame encoder 123 a, and a frame coded signal 127 a isproduced.

[0152] On the other hand, the dummy field 121 of the second VOB 119 iscoded in a field unit in a field encoder 124 b in a compressing unit 82b, and first the field coded signal 129 is coded. Next, the sub-signals,that is, the even interlace signal 80 b and odd interlace signal 79 bare assembled into a first field pair 126 a, and coded in frame in aframe encoder 123 b in the compressing unit 82 b, and a frame codedsignal 128 a is obtained.

[0153] In this way, an odd-first dummy field is added to the second VOB119, and hence it starts from an odd interlace signal. Being recorded inthe sequence of odd number and even number, it is effective to reproducesmoothly in a DVD player. In this case, one progressive signalcorresponds to frame coded signal 127 a and frame coded signal 128 a.However, owing to the presence of the field coded signal 129 which is adummy field, there is an offset time 130 of td between the frame codedsignal 127 a of the main signal and frame coded signal 128 a of thesub-signal. When reproducing progressive video, the output timing of thesub-signal musts be advanced by the portion of this offset time 130.

[0154] Referring now to FIG. 34, the operation of the reproducing device86 in FIG. 21 is more specifically described below. The signal from thereproducing unit 95 is separated into first VOB 118 of main signal andsecond VOB 119 of sub-signal. Since the first VOB 118 starts with an oddline, it may be expanded directly. However, at the beginning of thesecond VOB 119, the dummy field 129 is inserted as mentioned in FIG. 33.Accordingly, when reproduced directly, synchronism between the mainsignal and sub-signal is deviated by the portion of offset time 119 oftd, and it takes time to combine the first progressive video, and thescreen is not consecutive when changing over from VOB to next VOB. Inthis invention, therefore, the dummy field 121 is skipped by twomethods.

[0155] In a first method, the field coded signal 129 at the beginning ofthe second VOB 119 is once put into an expanding unit 132, and ifprogressive identification information is entered in the process ofexpanding by field expanding process or after expanding, the progressiveprocess changeover unit 135 is changed to yes, and the dummy field 121is skipped by dummy field detour means 132, and the even interlacesignal 80 b is issued first, which is followed by the even interlacesignal 79 b. This signal is synchronized, by synchronizing means 133,with an audio signal 134 recorded in the main signal and sub-title orsub-picture 135, and progressive images 93 a, 93 b are issued from theprogress transforming unit 90. Thus, by detour of dummy field 121, theodd field and even field are synchronized and combined, and theprogressive signal, audio signal and sub-picture matched on the timeaxis are issued. Incidentally, if progressive identification informationis not provided, the progressive changeover unit 135 is changed over toNo, and dummy field 121 is not removed, and hence the progressive videois not transformed, and the interlace signal 136 is issued. Thisinterlace signal 136 is issued in a conventional DVD player withoutprogressive function. Thus, turning on the dummy field detour means 132in the case of progressive process, and off otherwise, the interlacesignal of ordinary field coding can be normally reproduced withoutdropping the first field.

[0156] A second method is described below. This is employed when thedummy field 129 is a field coded GOP, and it can be separated from theGOP of frame of sub-signal. Before decoding, the field coded signal 129which is coded information of the dummy field is skipped by one GOP incoded information detour means 137 of dummy field. Skipped informationmay be entered in the buffer 131 b, or it may be skipped at the time ofoutput of the buffer 131 b. In the expanding unit 88 b, only the frameor field information of the sub-signal making a pair with the mainsignal is entered. Thus, by the ordinary means shown in FIG. 21, theeven interlace signal 80 and odd interlace signal 79 b are expanded andinterlace transformed, and synchronized with the main signal in thesynchronizing means 133, and transformed into progressive signals 93 a,93 b in the progressive transforming unit 90.

[0157] In the second method, since the dummy field is removed in thestage of coded information, it is not necessary to change the processingof the buffer 131 b or processing of the expanding unit 88. It is suitedwhen inserting the dummy field coded into one GOP at the beginning ofthe second VOB 119.

[0158] In the first method, the dummy field 129 and field signals ineach frame 127 a are field coded in batch to create one GOP, andtherefore, same as the seamless multi-angle method of high recordingefficiency, it is efficient when the dummy field is inserted at thebeginning of one interleaved block, and hence it gives an effect ofincreasing the recording time.

[0159] Thus, by skipping the dummy field 121 only in the case ofprogressive process, it is effective to reproduce the progressive videowithout seam in the boundary of one VOB and next VOB, or in theinterleaved block of seamless multi-angle.

[0160] Referring to the flowchart in FIG. 37, the procedure isdescribed. At step 138 a, a reproduction start command of (2n−1)-thangle data is received. At step 138 b, checking if there is progressiveidentifier or not, and if Yes, the process jumps to step 138 f, and ifNo, at step 138 c, it is checked if the following three conditions aresatisfied or not. Condition 1, there is a GOP of one field (or an oddnumber of fields) at the beginning of VOB of n-th angle. Condition 2,there is no GOP of one field consecutively to this GOP of one field.Condition 3, the beginning GOP of (2n−1)-th angle is not one field. Atstep 138 d, checking if these conditions are satisfied or not, and ifNo, interlace is processed at step 138 e, and only (2n−1)-th angle isissued. If Yes, changing over to progressive process at step 138 f, itis checked at step 138 g whether or not to reproduce from the beginningof the VOB of (2n-1)-th angle, and if No, the process jumps to step 138j, and if Yes, at step 138 h, the video of the first one field of n-thangle VOB or GOP for the portion of one field is skipped to produceoutput. If there is an audio signal in (2n−1)-th angle, the output isproduced by skipping the first offset time td (default: {fraction(1/60)} sec) of VOB. At step 138 j, the main signal of (2n−1)-th angleand sub-signal of 2n-th angle are decoded and synchronized, and combinedinto a progressive signal. At step 138 k, issuing a progressive image,when issuing seamless multi-angle at step 138 m, advancing to step 138n, each interleaved block of (2n−1)-th angle (sub-signal) is fielddecoded, and issued by skipping the first one. Or, at the time ofinterlace transformation, the output sequence of odd line and even linefields is reversed. At step 138 p, the progressive image is combined andissued.

[0161]FIG. 48 is a time chart when using the encoder of MPEG2 generallyused at the present. Most of the existing encoders can process only theinterlace signals of which first image begins with odd-first line. Onthe other hand, as shown in FIG. 48(2) in which the progressive signalin FIG. 48(1) is divided, the main signal by dividing the progressivesignal is odd-first, and is hence encoded from the first field. However,the sub-signal shown in FIG. 48(3) has an even-first beginning image,and the signal of t=t−1 in the first field is not encoded, and encodingstarts from t=t0. That is, only a pair of images 232 c, 232 d can beencoded. In this case, the boundary of the first VOB and second VOB isdeviated by one field in the sub-signal as compared with the mainsignal. Therefore, when reproducing consecutive VOBs, VOBs are smoothlyconnected, but when jumping from a certain VOB to other specificnonconsecutive VOB, as shown in FIG. 48(12), only one main signal can beobtained in the beginning field of the VOB. Accordingly, in theinvention, discarding the image 232 m of the first field, by reproducingfrom the image 232 n at t=t2, a perfect progressive signal is obtained.In this case, by discarding the audio data 233 a for the portion of onefield at the same time, it is effective that the sound is connected insynchronism.

[0162] Referring to FIG. 47, a method of inserting dummy field of oddfield without dropping the recording efficiency by using odd fieldrepeat identifier is described. In the sub-signal of progressive signalshown in FIG. 47(2), imaginary dummy fields 234 a, 234 b are set asshown in FIG. 47(3). The time stamp is advanced by one field. In the 3-2transforming unit in FIG. 47(5), three fields, 234 a, 234 b, 234 c, arevirtually combined into one frame 234 d. In this case, even-firstidentifier should be provided by nature, but since odd-first repeatidentifier for repeating odd-first is added, as shown in FIG. 47(8),when reproducing, odd field 234 f, even field 234 g, and odd field 234 hare reproduced in the 2-3 transforming unit. In this way, the odd-firstDVD standard is satisfied, and the compatibility is assured. Of course,in the progressive applicable type reproducing device, skipping thedummy field 234 h, seamless progressive signal is reproduced bycorrecting the time stamp by the portion of one field. In the dummyfield, only the same field is repeated twice, the recording efficiencyis not lowered at all.

[0163] Herein, by reference to FIG. 26 and FIG. 35(3), the procedure ofreproducing this optical disk 155 and changing over from first videosignal to second video signal at t=tc is described below. In thisexample of optical disk 155, as shown in FIG. 26, streams of fourchannels are interleaved and recorded in the interleaved block unit ofone GOP unit in the sequence of A1, B1, C1, D1, A2, B2, C2, D2, A3, B3,C3, D3. First is the output of the first video signal, interleavedblocks (ILB) of A and B, 84 a and 84 b, that is, A1 and B1 arereproduced continuously, and by jumping tracks 156, ILB 84 e and 84 f,that is, A2 and B2 are reproduced. At t=tc, changing over to the secondvideo signal, jumping tracks 157, ILB 84 i and 84 h, that is, C3 and D3are reproduced. Thus, A1, A2, C3 are reproduced as main signals, and B1,B2, D3 as sub-signals, and they are expanded and combined in theexpanding unit, and sent into the output unit 10 b from the combiningunit 101 b, and together with the sub-picture from the sub-picturedecoder 158 and sound from the audio signal reproducing unit 160, thethree signals are matched in phase in the AV synchronism control unit158, and issued as being matched in timing. Accordingly, the progressivesignal of the first stream and progressive signal of the second streamare reproduced continuously without seam together with sound andsub-picture. The seamless synchronizing method is described later.

[0164] Referring to FIG. 45, the procedure of synchronizing two videosand sound when reproducing two streams simultaneously, such asprogressive videos, stereoscopic videos or scope videos, is describedbelow. Reproduction of three or four streams such as 720P signals can besimilarly realized, and description is omitted herein.

[0165] First is mentioned a method of synchronizing two video streams inthe invention. As shown in FIG. 39, in the first place, a system streamreproduced from the optical head is once accumulated in a track buffer23, and sent into a first video decoder 69 d and a second video decoder69 c. In the tracks of the optical disk, two streams of progressivesignals, that is, first stream A and second stream B are recordedalternately in the interleaved block unit.

[0166] First, the stream A is reproduced by double speed rotation, andaccumulation of data in the first track buffer 23 a in the track buffer23 is started. This state is shown in FIG. 45(1), in which at t=t1 tot2, data is accumulated in the portion of one interleaved block (ILB) I1of first video signal in the period of one interleave time T1. The dataquantity in the first track buffer increases, and at t=t2, it increasesto the data quantity of one ILB, and accumulation of data for theportion of one ILB of the first video signal is complete. At t=t2, afterfinishing accumulation of the portion of one ILB over one GOP of thefirst video signal, this time, the second video signal of the stream Bis reproduced from a next interleaved block I2 of the optical disk, andas indicated by a solid line in FIG. 45(4), at t=t2, accumulation ofdata of second video signal is stated in a second track buffer 23 b, anddata is accumulated in the second track buffer 23 b up to t=t6. At thesame time, from t=t2 to t8, as shown in FIGS. 45(7), (10), the firstvideo signal and second video signal are fed into the first videodecoder 69 c and second video decoder 69 d from the track buffer 23 aand track buffer 23 b by synchronizing the video presentation timestamp, that is, the time of VPTS. These input signals are, as shown inFIGS. 45(8), (11), are issued as two sets of expanded video data fromthe first video decoder 69 c and second video decoder 69 d, from timet=t3 delayed by the video delay time twd as the MPEG expansion processtime. From t=t4 to t10, the two video data of stream A and stream B arecombined into a progressive signal in the progressive transforming unit170, and the progressive signal for the portion of one interleaved blockis issued.

[0167] Thus, from t=t2 to t8, data of one interleaved block is put intothe decoder. Therefore, nearly at a same rate, data in the first trackbuffer 23 a and second track buffer 23 b are consumed and decreased.Hence, as shown in FIG. 45(2), the data quantity in the first trackbuffer is decreased from t2 to t7, and at t=t7, it is decreased to ½ ofone ILB. At t=t7, data reproduction of interleaved block I5 starts, andincrement and decrement are canceled, the quantity continues to increaseup to t=t8, reaching one ILB at t=t8, but same as at t=t2, input intothe first decoder 69 c begins at t=t8, and hence the quantity continuesto decrease up to t=t11, and finally the buffer memory quantity is wortha half ILB.

[0168] In FIG. 45(4), transition of memory quantity in the second trackbuffer 23 a as the buffer quantity of the stream B is described. Att=t2, input of data B1 of stream B in the interleaved block I2 into thesecond track buffer 23 b begins, and at the same time transfer of dataB1 into the second video decoder 69 d starts, thereby canceling to ½,the buffer quantity at t=t6 is half ILB. In the case of multi-anglerecording of two angles of progressive signal in the invention, sincethere are four streams, that is, four interleaved blocks, from t=t6 tot7, tracks must be jumped from interleaved blocks I3, I4 to I5. Duringthis tj jump time 197, reproduction input of data from the optical diskis interrupted, and the buffer quantity in the stream B continues todecrease up to t=t8, and becomes nearly zero at t=t8.

[0169] At t=t8, reproduction data of data B2 of the interleaved block I6is entered, and it begins to increase again, and at t=t11, the memoryquantity of the second track buffer is half ILB. At t=t11, jumpingtracks, interleaved blocks I7, I8 are skipped, and interleaved block I9of A3 is accessed.

[0170] This operation is repeated.

[0171] The minimum required memory capacity for the track buffer 23summing up the first track buffer 23 a and second track buffer 23 b ofthe system of the invention is described below. The track buffercapacity 198 indicated by dotted line in FIG. 45(4) shows the dataquantity summing up the track buffer 23 a and track buffer 23 b. By thussetting the capacity of at least one ILB in total in the track buffer,seamless reproduction is realized.

[0172] In the invention, it is effective to prevent overflow orunderflow of track buffer by setting the total capacity of the trackbuffer 23 comprising track buffers 23 a and 23 b at one interleavedblock or more in progressive reproduction of the invention. As thechangeover method of system clock STC in the case of two streams isdescribed later in FIG. 31, there are two streams A and B in the case ofprogressive reproduction. In this case, supposing the two streams of twointerlace signals for composing progressive signals of one ILB to be A1and B1, the data of the first stream A1 is reproduced in a period ofhalf ILB as shown in FIG. 31(1), and all data is accumulated in thebuffer. Next, the data of the next stream B is reproduced as B1 aftercompletion of reproduction of A1 as shown in FIG. 31(2), and isaccumulated in the buffer. In this case, as mentioned above, since thereproduction data from the optical disk is controlled by the stream B inFIG. 31(2), the track buffer will not overflow. The SCR or stream clockfrom the track buffer of stream A or stream B shown in FIG. 31(3) isnearly synchronized with the reproduction start point J of the stream Bshown in FIG. 31(2), and the counter is reset. Since the stream B isissued at double speed, the stream clock is counted by the buffer at asingle speed as shown in FIG. 31(3), that is, at ½ speed. At point G,the stream clock is reset. The time VPTS2 of output of video signal ofstream B from the video decoder must be synchronized in consideration ofthe delay time Tvd such as MPEG decoding time. In this case, at point I,that is, when the increase of VPTs is interrupted, or t=Ti, the AVsynchronism control is restarted. In this case, checking VPTS2 of thestream B, by synchronizing the VPTS1 of the stream A with this VPTS2,synchronism is realized in a simple control of one system. In this case,the VPTS1 may be employed at the same time.

[0173] The audio data of synchronous stream B of audio is reproduced,and the STC is changed over at point H by using APTS of stream B asshown in FIG. 31(4). The sub-video signal of stream B is also changedover in the STC as shown in FIG. 31(4).

[0174] Thus, by Av synchronism by using the data of stream B bypriority, AV synchronism is realized by a simple control.

[0175] In this case, the streams A1, A2 will not overflow as all videodata is accumulated in the buffer memory. The stream B has a possibilityof overflow. In the invention, however, by synchronous control at streamB, as shown in FIG. 31(6), since the signal flow is controlled bychanging over the STC so that the VPTS2 may not exceed the threshold ofVPTS2, the buffer will not overflow.

[0176] Besides, by using the voice in the stream B in audioreproduction, as mentioned above, the buffer of the audio data can bereduced to half, and moreover, as shown in FIG. 31(4), by changing overthe STC at point H at t=Th, the sound is reproduced smoothly withoutexceeding the APTS threshold. The sub-video information is alsosynchronized and reproduced smoothly. Therefore, the video, sound, andsub-video such as sub-title are synchronized, and the picture and soundare reproduced without seam. In this case, recording of sound andsub-video of stream A may be omitted. Or, by adding sound and sub-videoin the stream B, the stream B2 is reproduced by the existing reproducingdevice, and by controlling reproduction of stream A by the second videosignal output control information adding unit 179 shown in FIG. 22, thetrouble of output of silent picture can be prevented. Thus, by omittingthe data of sound and sub-video in the stream A, the software ofprogressive video, for example, a movie of 2 hours can be recorded intwo layers of a disk according to the interleaved block recording methodof the invention. This effect is described below. The movie software canbe recorded for about 2 hours and 15 minutes in a 4.7 GB DVD of onelayer. When the progressive video of the invention is directly recordedin two channels without differential process, it requires a doublecapacity, that is, 9.4 GB. However, for example, the video signal is 4Mbps, and the sub-video and audio signal are nearly 1 Mbps. When 1 Mbpsof audio signal is recorded in one stream only, the required total is 9Mbps. That is, 90% of data quantity is enough, and 90% of 9.4 GB is 8.5GB, so that one-layer disk and progressive signals can be recorded in atwo-layer disk.

[0177] In the synchronizing method of the invention, of the signals in aset of two progressive signals, supposing the interleaved block ofstream B is recorded next to the interleaved block of stream A, as seenfrom the beginning of video data on the optical disk, by putting thebeginning data (A in this embodiment) in the track buffer, whenreproducing other data (B in this embodiment), it is designed tosynchronize by using mainly the synchronous information of stream B.More specifically, by changing over the system clock so that the videotime stamp VPTS1 of stream B may not exceed the threshold of the VPTS1,the video and audio are reproduced synchronously without interruptingthe screen. It is enough to read out the stream A from the buffer bysynchronizing with the time information such as VPTS2 which is the timestamp of the stream B, so that the control is simple.

[0178] Thus, in the invention, it is enough to control the second streamsynchronously by once accumulating the first stream in the buffer, andthe control is secure and simple. In this case, when the size of thebuffer memory is set at over one ILB, overflow or underflow does notoccur.

[0179] In the case of the existing DVD optical disk reproducing device,a standard buffer memory of 100 to 300 kB, about ⅕ of ILB is used. Inthe case of the invention, however, by a standard buffer memory of oneILB unit, it is possible to reproduce smoothly. One ILB is worth 0.5 to2 seconds, but in the case of multi-angle, since the waiting time isallowed by about one second, it is actually used in a range of 0.5 to 1sec. Therefore, considering the stream of 8 Mbps at maximum of 1 sec, inthe DVD optical disk reproducing device of the invention, it is enoughto use a buffer memory of 1 MB or more.

[0180] In the above operation, the synchronous control unit 166 in FIG.30 changes over the STC by using the synchronous data of the secondvideo signal of interleaved blocks I2 and I6 in FIG. 45(1), and seamlessreproduction between the interleaved blocks is realized. Whenreproducing data of interleaved blocks I2, I6, by controlling the motorrotating speed reproducing track while monitoring the buffer quantity ofthe stream B, it is optimized so that the memory quantity of the trackbuffers 23 a, 23 b may not overflow, and it is effective to decrease thememory quantity of the track buffer. The data in the interleaved blocksI1, I5 of the stream A are put entirely in the track buffer 23 a, and itis not suited for optimizing the buffer size by controlling thereproduction by the signals of two streams A. When reproduced by usingthe audio data of the interleaved blocks I1, I5, in order to match withthe time stamp of the outputs of video data in FIGS. 45(8), (11), it isnecessary, as shown in FIG. 45(3), to accumulate audio data or sub-videodata of one interleaved block or more in the track buffer 23 (FIG. 39)or audio decoder buffer 172 (FIG. 39), but by using the audio data ofinterleaved blocks I2, I6, as shown in FIG. 45(5), it is enough with ½,that is, half ILB data, so that the memory quantity of the track buffer23 (FIG. 39) or audio decoder buffer 172 (FIG. 39) may be half.

[0181] Also, as shown in FIG. 45, when reproducing a set of I1, I2, anda set of I5, I6 containing main signals and complementary signals ofprogressive signals, by accumulating the interleaved blocks I1, I5 inthe buffer, when the motor rotation is controlled on the basis of thereproduction data of next interleaved blocks I2, I6, the memory quantityof the buffer is decreased. As for the changeover timing of STC of theAV synchronous control unit 158 in FIG. 30, on the basis of the STC ofthe interleaved blocks I2, I6, it is effective to decode stably withoutoverflow of buffer.

[0182] Moreover, as shown in FIG. 37, at the time of progressive signalreproduction, the method of skipping the first field of VOB ismentioned, but as a second realistic method, as shown in FIG. 22, in therecording device 99, of the two images of the image with interlacetransformed odd-first identifier 199 and image with even-firstidentifier 200, only the even-first identifier 200 is transformed intoan odd-first identifier 202 by an even/odd transforming unit 201, and byadding the odd-first identifier to each MPEG data, the beginning of allVOBs becomes odd-first.

[0183] At the reproducing device side, as shown in FIG. 21, the data ofodd-first identifier 199 and odd-first identifier 202 by even-firsttransformation are reproduced. As shown at step 203, checking ifprogressive signal reproduction or not, if Yes, at step 204, theodd-first identifier of the second video signal is changed to aneven-first identifier 200 a, and is sent into an interlace transformingunit 71 b of the MPEG decoder. If No, the identifier is not changed. Inthe interlace transforming unit 71 b, since the field of the line isissued first from the frame image of the second video signal, theeven-first image is issued. In the combining unit 90, the even-firstimage of the second video signal and the odd-first image of the firstvideo signal are combined, and a normal progressive image is issued. Inthis method, the beginning of all interleaved blocks becomes odd-first,and the seamless multi-angle video is reproduced normally in the DVDstandard reproducing device. In the case of seamless multi-anglereproduction, since the beginning of each interleaved block is limitedto odd-first, dummy field is not required in this method, and hence therecording efficiency is not lowered.

[0184] In this second method of aligning the odd-first lines, the firstvideo signal can be reproduced normally also in the existing reproducingdevice. However, when interlace transformed according to the odd-firstidentifier of the second video signal in the existing reproducingdevice, odd and even fields are inverted, and videos of poor qualitylowered in resolution are issued. To avoid this, by the second videosignal output limiting information adding unit explained in FIG. 40,when reproducing with the conventional reproducing device, by recordingthe information for limiting the reproduction of the second video signalwithin the DVD standard in the optical disk 85, the second video signalis not reproduced in the existing reproducing device, and presentationof uncomfortable video to the user can be avoided.

[0185] In this recording device, when compressing a pair of field imagesof odd-first image and transformed odd-first image by variable coding incompressing units 81 a, 82 b, if motion detection and compensation aredone separately, block distortion appears separately when encodinghard-to-compress images, and the decoded image is dirty when combinedinto progressive signal. To avoid this, in the invention, by employingthe same motion vector and encoding the motion compensation by the samemotion detection compensating unit 205, when two fields are decoded, theblock distortions are aligned and are hence less obvious. At the sametime, the encoding load decreases.

[0186] The operation of the AV synchronous control unit 158 isdescribed. Since the AV synchronous control unit is one of the mostimportant units in the invention, and is hence described in particulardetail.

[0187] The operation of the system control unit 21 in FIG. 5 isdescribed. First, the system control unit 21 judges if the optical diskis set (inserted) in the DVD reproducing device or not. When setting isdetected, by controlling the mechanical control unit and signal controlunit, the disk rotation is controlled until stable reading is achieved,and the optical pickup is moved when stabilized, and the volumeinformation file shown in FIG. 28 is read out.

[0188] Furthermore, the system control unit 21 reproduces the programchain group for volume menu according to the volume menu managementinformation in the volume information file in FIG. 28. When reproducingthis program chain group for volume menu, the user can designate thenumbers of desired audio data and sub-video data. Reproduction ofprogram chain for volume menu in reproduction time of optical disk maybe omitted if not necessary depending on the application of multimediadata.

[0189] The system control unit 21 reproduces and displays the programchain group for title menu according to the tile group managementinformation in the volume information file, reads out the filemanagement information of the video file including the title selectedaccording to the selection by the user, and branches into program chainsof the title beginning. Further, this program chain group is reproduced.

[0190]FIG. 29 is a flowchart showing the detailed procedure ofreproducing process of the program chain group by the system controlunit 21. In FIG. 29, at steps 235 a, 235 b, 235 c, first, the systemcontrol unit 21 reads out the corresponding program chain informationfrom the program chain information table of volume information file orvideo file. At step 235 d, if program chain is not finished, the processadvances to step 235 e.

[0191] Consequently, at step 235 e, referring to the seamless connectioninstruction information of the cell to be transferred next in theprogram chain information, it is judged whether the connection betweenthe present cell and the immediately preceding cell is for seamlessconnection or not, and if seamless connection is judged necessary, theprocess advances to step 235 f for seamless connection process, and ifseamless connection is not necessary, the process advances to ordinaryconnection process.

[0192] At step, 235 f, reading the DSI packet by controlling themechanical control unit and signal processing unit, the VOB reproductionend time (VOB₁₃ E₁₃ PTM) existing in the DSI packet of the celltransferred first, and the VOB reproduction start time (VOB_S_PTM)existing in the DSI packet of the cell to be transferred next are readout.

[0193] At the next step 235 h, calculating “VOB reproduction end time(VOB_E_PTM)—VOB reproduction start time (VOB_S_PTM), it is transferredas the STC offset of this cell and the cell transferred immediatelybefore, to the STC offset combining unit 164 in the AV synchronouscontrol unit 158 in FIG. 30.

[0194] At the same time, at step 235 i, the VOB reproduction end time(VOB_E_PTM) is transferred to the STC changeover timing control unit 166as changeover time T4 of the STC changeover switch 162 e.

[0195] It is instructed to the mechanical control unit so as to read outthe data until the final position of the cell. As a result, the data ofthe corresponding cell is transferred to the track buffer 23 at step 235j, and as soon as the transfer is over, the program chain information atstep 235 c is read out.

[0196] At step 235 e, if judged not to be seamless connection, transferto the track buffer 23 is effected up tot he end of the system stream,and the program chain information at step 235 c is read out.

[0197] Next are explained two embodiments relating to AV synchronouscontrol method of the seamless connection control for seamlessreproduction in the invention. These are detailed explanation about theAV synchronous control unit 158 in FIG. 26 and FIG. 39.

[0198] The system decoder 161, audio decoder 160, video decoders 69 c,69 d, and sub-video decoder 159 in FIG. 39 are all synchronized with thesystem time clock given from the AV synchronous control unit in FIG. 30,and the data in the system stream is processed.

[0199] In a first method, referring to FIG. 30, the AV synchronouscontrol unit 158 is explained.

[0200] In FIG. 30, the AV synchronous control unit is composed of STCchangeover switches 162 a, 162 b, 162 c, 162 d, STC 163, STC offsetcombining unit 164, STC setting unit 165, and STC changeover timingcontrol unit 166.

[0201] The STC changeover switches 162 a, 162 b, 162 c, 162 d, 162 echange over the output value of the STC 163 and output value of the STCoffset combining unit 164 as reference clock to be given respectively tothe system decoder 161, audio decoder 160, main video decoder 69 c,sub-video decoder 69 d, and sub-video decoder 159.

[0202] The STC 163 is a reference clock for the entire MPEG decoder inFIG. 39 in ordinary reproduction.

[0203] The STC offset combining unit 164 continues to issue the value ofsubtracting the STC offset value given from the system control, from thevalue of the STC 163.

[0204] The STC setting unit 165 sets STC initial value given from thesystem control unit or the STC offset combined value given from the STCoffset combining unit 164, to the STC 163 at the timing given from theSTC changeover timing control unit 166.

[0205] The STC changeover timing control unit 166 controls the STCchangeover switches 162 a to 162 e and STC setting 165 on the basis ofthe STC changeover timing information given from the system control unitand the STC offset combined value given from the STC offset combiningunit 164.

[0206] The STC offset value is an offset value used when changing theSTC value when continuously reproducing by connecting system stream #1and system stream #2 having different STC initial values.

[0207] More specifically, it is obtained by subtracting the “VOBreproduction start time (VOB_S_PTM)” described in the DSI of the systemstream #2 to be reproduced next, from the “VOB reproduction end time(VOB_E_PTM)” described in the DSI packet of the system stream #1reproduced in the first place. Such information of display time iscalculated preliminarily by reading out by the system control unit 167when the data being readout from the optical disk in FIG. 5 is put intothe track buffer 23.

[0208] The calculated offset value is given to the STC offset combiningunit 164 until the final pack of the system stream #1 is fed into thesystem decoder 161.

[0209] The data decoding processing unit 165 in FIG. 5 operates as anMPEG decoder except when controlling seamless connection. The STC offsetgiven from the system control unit 167 at this time is 0 or an arbitraryvalue, and the STC changeover switches 162 a to 162 e in FIG. 30 arealways selected at the STC 163 side.

[0210] Referring to the flowchart in FIG. 38, changeover of STCchangeover switches 162 a to 162 e and operation of STC 163 at thejunction of the system streams are explained below in the case twosystem streams not continuous in the STC value, system stream #1 andsystem stream #2, are entered continuously in the system decoder 161.

[0211] Explanations of SCR, APTS, VPTS, VDTS of the system stream #1 andsystem stream #2 to be entered are omitted.

[0212] Suppose the STC initial value corresponding to the system stream#1 during reproduction is preliminarily set in the STC 163 from the STCsetting unit 165 and is being counted up sequentially along thereproduction operation. First, the system control unit 167 (FIG. 5)calculates the STC offset value by the method mentioned above, and setsthis value in the STC offset combining unit 164 until the final pack ofsystem stream #1 is put in the decoder buffer. The STC offset combiningunit 164 continues to issue the subtraction value of the STC offsetvalue from the value of the STC 163 (step 168 a).

[0213] The STC changeover timing control unit 166 obtains the time T1when the final pack in the system stream #1 reproduced first is put intothe decoder buffer, and changes over the STC changeover switch 162 a tothe output side of the STC offset combining unit 164 at time T1 (step168 b).

[0214] Thereafter the output of the STC offset combining unit 164 isgiven to the STC value the system decoder 161 refers to, and thetransfer timing of the system stream #2 to the system decoder 161 isdetermined by the SCR described in the pack header of system stream #2.

[0215] The STC changeover timing control unit 166 obtains the time T2when reproduction of final audio frame of system stream #1 reproducedfirst is terminated, and changes over the STC changeover switch 162 b tothe output side of the STC offset combining unit 164 at time T2 (step168 c). The method of obtaining time T2 is described below.

[0216] Thereafter the output of the STC offset combining unit 164 isgiven to the STC value the audio decoder 160 refers to, and the audiooutput timing of the system stream #2 is determined by the APTSdescribed in the audio packet of system stream #2.

[0217] The STC changeover timing control unit 166 obtains the time T3,T′3 when decoding of final video frame of main signal and sub-signal ofsystem stream #1 reproduced first is terminated, and changes over theSTC changeover switches 162 c, 162 d to the output side of the STCoffset combining unit 164 at time T3, T′3 (step 168 d). The method ofobtaining time T3 is described below. Thereafter the output of the STCoffset combining unit 164 is given to the STC value the system decoders69 c, 69 d refer to, and the timing of video decoding of the systemstream #2 is determined by the VPTS described in the video packet ofsystem stream #2. The STC changeover timing control unit 166 obtains thetime T4 when reproduction output of final video frame of system stream#1 reproduced first is terminated, and changes over the STC changeoverswitch 162 e to the output side of the STC offset combining unit 164 attime T4 (step 168 e). The method of obtaining time T4 is describedbelow.

[0218] Thereafter the output of the STC offset combining unit 164 isgiven to the STC value the video output changeover switch 169 andsub-video decoder 159 refer to, and the timing of video output andsub-video output of system stream #2 is determined by VPTS and SPTSdescribed in the video packet and sub-video packet of system stream #2.

[0219] When changeover of these STC changeover switches 162 a to 162 eis over, the STC setting unit 165 sets the value given from the STCoffset combining unit 164 in the STC 162 (step 168 f) (which is calledreloading of STC 163), and all switches at steps 162 a to 162 e arechanged over to the STC 163 side (step 168 g).

[0220] Thereafter the output of the STC 163 is given to the STC valuethe audio decoder 160, video decoders 69 d, 69 c, video outputchangeover switch 169, and sub-video decoder 159 refer to, and theoperation returns to the normal state.

[0221] Herein, two means are mentioned as the method of obtaining thetime T1 to T4 as the STC changeover timing.

[0222] In the first means, since the time T1 to T4 can be easilycalculated when creating the stream, the information expressing the timeT1 to T4 is described in the disk preliminarily, and the system controlunit 21 reads it out and transmits to the STC changeover timing controlunit 166.

[0223] In particular, as for T4, the “VOB reproduction end time(VOB_E_PTM)” recorded in the DSI used when determining the STC offsetcan be directly used.

[0224] The value to be recorded at this time is described on the basisof the STC value used in the system stream #1 reproduced first, and themoment the count-up value of STC 163 becomes the time T1 to T4, the STCchangeover timing control unit 166 changes over the STC changeoverswitches 162 a to 162 e.

[0225] In the second means, the timing for reading out is obtained fromthe timing of writing beginning data of system stream #2 into the trackbuffer 23, video decoder buffers 171, 171 a, and audio decoder buffer172.

[0226] Assuming the track buffer 23 to be a ring buffer composed ofwrite pointer, read pointer, and data memory, more specifically, thesystem control unit 21 is designed to read out the address indicated bythe write pointer and the address indicated by the read pointer in thetrack buffer 23, and the moment when the pack written immediately beforeis read out is detected from the address indicated by the write pointerand the address indicated by the read pointer when the target pack iswritten in.

[0227] The system control unit 21 designates and reads out the beginningaddress of the system stream #2 on the optical disk when transferringfrom system stream #1 to reproduction of system stream #2, so that themoment when the beginning data of the system stream #2 is stored in thetrack buffer 23 is known. Consequently, by marking the address where thebeginning pack of the system stream #2 is written, the moment when onepack before is read out completely is supposed to be T1, and the time T1is obtained.

[0228] The system control unit 21, the moment T1 is obtained, notices itto the video decoders 69 c, 69 d and audio decoder 160, and thereforethe video decoders 69 c, 69 d and audio decoder 160 can know that thebeginning packet of system stream #2 is transferred to the video buffer171 and audio buffer 172 in the subsequent transfer.

[0229] Thus, by managing each decoder buffer same as the buffermanagement of the track buffer 21, the two video decoders 69 c, 69 d andaudio decoder 160 obtain T2, T3 the moment the final packet of systemstream #1 is transferred In detection of T1, however, if all data areread out from the video decoder buffer 171 or audio decoder buffer 172(right after decoding of final frame of system stream #1) and data to bewritten in has not reached yet (the transfer time between packs isvacant), since there is no data to be written in, the address cannot bemanaged. In this case, too, since the packet of the frame to be decodednext is securely transferred until the next decoding timing (thedecoding timing of the beginning frame of system stream #2), thechangeover timing is known by defining the packet transfer moment to beT2 or T3.

[0230] As for T4, as mentioned above, the “display end time (VOB_E_PTM)of final frame of video of system stream #1” described in the DSI packetmay be used directly.

[0231] A second seamless reproduction method is described below.

[0232]FIG. 31 is a diagram showing the timing of reproduction output ofthe system stream from input in the data decoding processing unit inFIG. 38 through decoder buffer and decoding process. Referring to FIG.31, changes of values of APTS and VPTS in the portion for connectingsystem stream #1 and system stream #2 are explained, and the method ofAV synchronous control in the seamless connection portion in theoperation for actually processing the stream is described.

[0233] Next, referring to the graph in FIG. 31, the method of seamlessconnection control according to the flow in the flowchart in FIG. 43 isdescribed.

[0234] Start timing of seamless connection control is obtained in theSCR graph in FIG. 31(3). The period of continuous increase of SCR valuein this graph corresponds to the period of transfer of system stream #1from the track buffer 23 (FIG. 5) to the data decoding processing unit16 (FIG. 5), and the value of SCR is 0 only at piont G when transfer ofsystem steam #1 is over and transfer of system stream #2 is started.Therefore, by judging point G when SCR value becomes 0, it is known thata new system stream #2 is put into the data decoding processing unit 16,and at this point (time Tg), the synchronous mechanism control unit cancancel (turn off) the AV synchronous mechanism of the reproductionoutput unit.

[0235] Detection of SCR value of 0 is also possible after processing ofthe signal read out from the optical disk, or when writing into thetrack buffer 23. The AV synchronous mechanism may be turned off on thebasis of detection at this point.

[0236] As for the timing for starting (turning on) the AV synchronousmechanism once turned off, to prevent mismatched reproduction of audioand video, it is necessary to know that both audio output and videooutput included in system stream #1 are changed to a new system stream#2. The moment of change of audio output to a new system stream #2 isknown by detecting point H when increase of APTS value is suspended.Similarly, the moment of change of video output to a new system stream#2 is known by detecting point I when increase of VPTS value issuspended. Therefore, the synchronous mechanism control unit can resumeAV synchronism immediately (at time Ti) after detection of appearance ofboth point H and point I.

[0237] When the value of SCR is not set in the STC in the period fromtime Tg to time Ti, or when the value of APTS and value of VPTS arecompared directly, the off period of AV synchronous mechanism may befurther shortened.

[0238] For this purpose, by monitoring both values of APTS of audiooutput data and VPTS of video output data issued from the data decodingprocessing unit 16, when either value begins to decrease first, it isdetected, and the AV synchronism mechanism is turned off immediately,that is, at time Th in FIG. 31.

[0239] However, as explained herein, when judging the timing bydetecting if increase of the value of APTS and value of VPTS iscontinuing or not, it is evident that the value of APTS and value ofVPTS are sure to decrease when the system stream is connected. In otherwords, it is enough when the final values of APTS and VPTS in the systemstream are larger than the initial maximum values of APTS and VPTS inthe system stream.

[0240] The maximum values of initial values of APTS and VPTS (ΔTad ΔTvdin the diagram) are determined as follows.

[0241] The initial values of APTS and VPTS are the sums of the time forstoring video data and audio data in the video buffer and audio buffer,and the video reorder (in the MPEG video, the decoding sequence anddisplay sequence of picture are not matched, and display is delayed byone picture at maximum as compared with decoding). Therefore, the sumsof the time required for the video buffer and audio buffer until filledup, and the display delay (time of one frame) due to video reorder arethe maximum values of initial values of APTS and VPTS.

[0242] To create the system stream, hence, it may be composed so thatthe final values of APTS and VPTS in the system stream may exceed thesevalues.

[0243] In the embodiment, so far, as for the judging standard of turn-ontiming of AV synchronous mechanism after system stream connection, themethod of judging if the values of APTS and VPTS are increasing or notis mentioned, but it is also possible to realize by the followingjudgement of threshold. First, at the reproducing device side, the audiothreshold and video threshold shown in the graphs in FIGS. 31(4) and (5)are determined. These values are equal to maximum values of initialvalues of APTS and VPTS in the system stream, and same as the maximumvalues mentioned above.

[0244] The values of APTS and VPTS read by the APTS reading means andVPTS reading means are judged to be less than the audio threshold andvideo threshold or not. If the values APTS and VPTS are larger than theaudio threshold and video threshold, data are not changed to the outputdata of new system stream, and if smaller, output data of a new systemstream is started, so that OFF or ON timing of AV synchronous mechanismis known.

[0245] By such on/off control of the AV synchronous mechanism, seamlessreproduction without disturbance in reproduction state is realized atthe junction of system streams.

INDUSTRIAL APPLICABILITY

[0246] By dividing basic video signal and interpolating video signal inframe groups of one GOP or more each, and recording on an optical diskas interleaved blocks 54, 55 by interleaving alternately, in aprogressive (stereoscopic) applicable type reproducing device,progressive (stereoscopic) videos can be obtained by reproducinginformation of both right and left interleaved blocks of odd fields (forthe right eye) and even fields (for the left eye). In the progressive(stereoscopic) non-applicable type reproducing device, when a diskrecording progressive (stereoscopic) videos is reproduced, byreproducing the interleaved block of only odd fields (for the right eye)or even fields (for the left eye) either by jumping tracks, a perfectordinary two-dimensional video can be obtained. Thus, mutualcompatibility is realized.

[0247] In particular, by using an arrangement information file ofprogressive (stereoscopic) video, progressive (stereoscopic) videoidentifiers are recorded in the optical disk. It is therefore easy tojudge where the progressive (stereoscopic) video is present, and it iseffective to avoid progressive reproduction of two ordinary interlacesignals, or outputs of images of two difference contents by mistake intothe right eye and left eye of the stereoscopic television.

[0248] In the stereoscopic video applicable reproducing device, usingthe pointer used in two dimensions, the method of the invention forchanging the access procedure is employed only when the stereoscopicvideo identifier is present, so that the stereoscopic videos can bereproduced continuously. Hence the stereoscopic video applicablereproducing device can be realized without changing the two-dimensionalformat.

1. An optical disk comprising: a plurality of first interleaved blocksof a first video stream and a plurality of second interleaved blocks ofa second video stream recorded a plural of times on tracks of saidoptical disk in certain order, wherein said first and said second videostream are separated from a original video signal in a vertical or ahorizontal direction by separating means; said original video signal hasa first resolution; said first and said second video signals have asecond resolution that is lower than the first resolution; said firstvideo stream and said second video stream comprise an MPEG signal whichis encoded by variable length encoding and a timing data forreproduction of said original video signal; each of said first andsecond interleaved blocks has a video stream of more than 1 GOP (Groupof Pictures) and less than 30 GOP which is segmented by data segmentingmeans; and each of said first interleaved blocks and said secondinterleaved blocks is continuously recorded on more than one track ofsaid optical disk.
 2. An optical disk, wherein said first video streamcomprises encoded NTSC, PAL or SECAM signals.
 3. An optical diskaccording to claim 1, wherein said second interleaved block has a sametiming information with a timing information recorded on said firstinterleaved block; and said first and said second interleaved blocks arerecorded in an approximately the same area on said optical disk.
 4. Anoptical disk according to claim 1, further comprising: a plurality offirst interleaved blocks of a first video stream and a plurality ofsecond interleaved blocks of a second video stream recorded on tracks ofsaid optical disk in certain order, wherein said original video signalis separated into a plurality of video streams including said first andsaid second video stream in a vertical and/or a horizontal direction byseparating means; said original video signal has a first resolution;said first and said second video signal have a second resolution that islower than said first resolution; said first and second video streamscomprise an MPEG signal which is encoded by variable length encoding anda timing data for synchronous decoding of said original video signals;each of said first and second interleaved blocks comprise a data unit;said data unit has frame signals of more than 1 GOP (Group of Pictures)and less than 30 GOP which is segmented from each of said first and saidsecond video stream by data segmenting means; and a segmentidentification data recorded on said optical disk, wherein said segmentidentification data indicates that each of said first and said secondinterleaved blocks are continuously recorded on more than one track ofsaid optical disk.
 5. An optical disk according to claim 1 furthercomprising a restriction information for restricting reproducing of avideo stream other than said first video stream when a certain diskplayer is used.
 6. An optical disk according to claim 1 furthercomprising: a filter for attenuating a vertical and/or a horizontal highfrequency component of said original video signal; wherein said firstvideo stream is generated by separating an original video signal by saidseparating means after filtering by said filter.
 7. An optical diskaccording to claim 6, further comprising a filtering identifier recordedon said optical disk; wherein said filtering identifier indicates thatsaid first video stream is generated by separating said original videosignal by said separating means after said original video signal passessaid filter for attenuating a vertical and/or a horizontal highfrequency component of said original video signal.
 8. An optical diskaccording to claim 1, wherein said original video signals areprogressive picture signals; first inter-lace signals and secondinter-lace signals are generated by separating said original videosignal in a vertical direction by said separating means; said firstinter-lace signals start Odd-Line first and said second inter-lacesignals start Even-Line first; and said first inter-lace signals or saidsecond inter-lace signals are recorded as said first video stream andthe other inter-lace signals are recorded as said second video stream.9. An optical disk according to claim 8, wherein a restrictioninformation is further recorded on said optical disk; wherein saidinformation is for restricting reproduction of a video stream other thanthe video stream of said first interlace stream when a certain diskplayer is used.
 10. An optical disk according to claim 8, wherein saidinterlace signals are obtained by said separating means afterattenuating a vertical high frequency component of said progressivepicture signal.
 11. An optical disk according to claim 1, wherein saidoriginal video signals are progressive picture signals; a firstinter-lace signal and a second inter-lace signal are generated byseparating said progressive signals in a vertical direction by pictureseparating means; said first inter-lace signal starts Odd-Line first andsaid second inter-lace signal starts Even-Line first; and said firstinter-lace signal is recorded as said first video stream and adifference signal between first and second inter-lace video signal isrecorded as said second video stream.
 12. An optical disk according toclaim 10, further comprising a filtering identifier recorded on saidoptical disk; wherein said filtering identifier indicates that saidinter-lace signals are obtained by filtering said progressive signals bya low-pass filter, thus removing the vertical high frequency componentof said progressive signals.
 13. An optical disk according to claim 8,wherein said original video signals are progressive picture signals;first inter-lace signals and second inter-lace signals are generated byseparating said original video signal in a vertical direction by saidseparating means; and said first inter-lace signals start Odd-Line firstand said second inter-lace signals start Even-Line first; one of saidfirst inter-lace signals and said second inter-lace signals are recordedas said first video stream and the other inter-lace signals are recordedas said second video stream; and at least one inter-lace signal whichstarts Odd Line first is added at a lead part of a VOB (Video Object) ofsaid second inter-lace picture signals which start Even-Line first ofsaid second video stream.
 14. An optical disk according to claim 8;wherein said original video signals are progressive picture signals;first inter-lace signals and second inter-lace signals are generated byseparating said original video signal in a vertical direction by saidseparating means; said first inter-lace signals start with odd linefirst and said second inter-lace signals start with even line first; oneof said first inter-lace signals and said second inter-lace signals arerecorded as said first video stream and the other inter-lace signals arerecorded as said second video stream; and an Even-Field firstidentification information is replaced with an Odd-Field firstidentification information in a field identification information of MPEGdata of said interleaved block of said second video stream.
 15. Areproducing device comprising: a reproduction means for reproducing anoptical disk on which interleaved blocks are recorded in certain order;wherein at least two video streams including first and second videostream are separated into a interleaved block unit having a video streamof more than 1 GOP (Group of Pictures) and less than 30 GOP; and forreproducing first interleaved blocks and second interleaved blocks incertain order; wherein said first interleaved block has first timinginformation of said first video stream;and said second interleaved blockhas second timing information of said second video stream; a buffermemory to store said reproduced first interleaved blocks and said secondinterleaved blocks; first decoding means for decoding first picturesignals; second decoding means for decoding second picture signals;composition means for composing said first picture signals and saidsecond picture signals into one stream of picture signals; out-put meansto put out said picture signals.
 16. A reproducing device of claim 15,further comprising a detecting means for detecting a compositionidentification information indicating to compose said first video streamand said second video stream recorded on a optical disk, wherein, saidcomposition means composes said first video stream and said second videostream when said detection means detects the composition identificationinformation.
 17. A reproducing device of claim 15, wherein areproduction of said optical disk is processed by steps of: reproducingsaid optical disk on which said first interleaved blocks are recordednext to said second interleaved blocks; and reproducing a second picturedata of said second interleaved blocks first, storing said secondpicture data of said second interleaved blocks on said buffer memory;reproducing a first picture data of said first interleaved blocks,storing said first picture data of said first interleaved blocks;producing synchronous timing information taking precedence said firsttiming information recorded on said first interleaved blocks over saidsecond timing information recorded on said second interleaved blocks,decoding said first picture signal from said first picture data usingsaid synchronous timing information by said first picture decoder;decoding said second picture signal so as to synchronize with saidsynchronous timing information by said second picture decoder composingsingle picture signals from said first picture signals and said secondpicture signals synchronizing with said first timing information and/orsaid second timing information and/or said synchronous timinginformation.
 18. A reproducing device of claim 15 further comprising asound signal decoding means and a Picture-Sound synchronizing means;reproducing a sound data of said first interleaved block; storing saidsound data on said buffer memory taking precedence over the other;decoding sound signals from said sound data by said sound signaldecoding means; synchronizing said sound signals and said picturesignals by said Picture-Sound synchronous means; outputting said soundsignals.
 19. A reproducing device of claim 15, further comprising; alow-pass filter for attenuating a vertical and/or horizontal highfrequency component of picture signals, wherein said composed picturesignal is not attenuated and outputted by said low pass filter whenobtaining a composed picture signal by said composition means; and saidcomposed picture signal is attenuated by said low pass filter whenobtaining either the vertical constituent or the horizontal constituentof picture signals having a lower resolution than said composed picturesignals.
 20. A reproducing device of claim 19, further comprising adetection means for detecting filtering identification informationindicating that the high frequency component of said first video streamand/or said second video stream is already attenuated when recorded onsaid optical disk; wherein said low-pass filter is turned off when saiddetection means detect said filtering identification information.
 21. Areproducing device of claim 15, wherein a reproduction of said opticaldisk is processed by steps of: reproducing a base picture signal withsaid first decoding means; reproducing a supplemental picture signalwith said second decoding means; composing said base picture signal andsaid supplemental picture signal into one picture signal; and outputtingsaid composed picture signal.
 22. A reproducing device of claim 21,wherein said supplemental picture signal is a difference picture signalof said composed picture signal and said base picture signal; and saidcomposition means have a difference decoding means; whereby composedpicture signal is decoded from said base picture signal and saiddifference picture signal by said difference decoding means.
 23. Areproducing device of claim 15 having at least two decoding means,wherein a reproduction of said optical disk is processed by steps of:reproducing a first inter-lace signal as said first picture signal bysaid first decoding means; reproducing a second inter-lace signal assaid second picture signal by said second decoding means; synchronizingsaid first and said second picture signals; composing said first andsaid second picture signal into a progressive picture signal; andoutputting said progressive picture signal.
 24. A reproducing device ofclaim 23, wherein a reproduction of said optical disk is processed bysteps of; attenuating said progressive picture signal by a low-passfilter for attenuating a vertical high frequency component of an inputsignal; separating said progressive signal into an Odd-Field signalhaving an odd line and an Even-Line signal having an even line byseparation means; outputting alternately said Odd-Field signal and saidEven-Field signal as a inter-lace picture signal.
 25. A reproducingdevice of claim 24, further comprising a first output means and a secondoutput means; wherein said progressive picture signal is output fromsaid first output means and said inter-lace picture signal is put outfrom said second output means.
 26. An optical disk comprising: firstinterleaved blocks of a first video stream and second interleaved blocksof a second video stream recorded a plurality of times on tracks of saidoptical disk in certain order, wherein at least two video streamsincluding said first video stream for a right eye and said second videostream for a left eye is generated by separating a 3-D picture signal;said-first and second video streams comprise MPEG signals which isencoded by variable length encoding and timing data for a reproductionof said original video signals; each of said first and secondinterleaved blocks has a video stream of more than 1 GOP (Group ofPictures) and less than 30 GOP separated by a data segmenting means; andeach of said first and said second interleaved blocks is continuouslyrecorded on more than one track of said optical disk.
 27. An opticaldisk, wherein said first video stream comprises encoded NTSC, PAL orSECAM signals.
 28. An optical disk of claim 27, wherein said secondinterleaved block has approximately the same timing information with atiming information recorded on said first interleaved block.
 29. Anoptical disk of claim 27, further comprising 3-D identificationinformation indicating that a 3-D picture is recorded on said opticaldisk.
 30. An optical disk of claim 27, further comprising anidentification information recorded thereon for restricting reproductionof video streams other than said first video stream when said opticaldisk is reproduced with a certain disk player.
 31. An optical disk ofclaim 27, wherein said 3-D picture signal is separated into a firstinter-lace signal which starts Odd-Line first and a second inter-lacesignal which starts Even-Line first; said first video stream comprisessaid first inter-lace signal; and said second video stream comprisessaid second interlace signal.
 32. An optical disk reproducing device forreproducing an optical disk on which at least two video streams,including a first video stream for a right eye and a second video streamfor a left eye, are recorded; said video streams are separated into aninterleaved block having a video stream of more than 1 GOP (Group ofPictures) and less than 30 GOP; comprising; a reproduction means forreproducing said first interleaved blocks and said second interleavedblocks; wherein said first interleaved block has a first timinginformation of said first video stream;and said second interleaved blockhas a second timing information of said second video stream; a buffermemory to store reproduced picture signals; first decoding means fordecoding first picture signals; second decoding means for decodingsecond picture signals; synchronizing means for synchronizing said firstpicture signal and said second picture signal; and output means foroutputting said first picture signal and said second picture signalindependently as a 3-D picture signal for a right eye and a 3-D picturesignal for a left eye synchronized with said first timing informationand/or second timing information and/or outputting in a time shearingmanner said first picture signal for a right eye and said second picturesignal for a left eye alternately as one 3-D picture signal synchronizedwith said first timing information and/or second timing information. 33.An optical disk reproducing device of claim 32, wherein said outputmeans for outputting said first picture signal and said second picturesignal independently as said 3-D picture signal for a right eye and said3-D picture signal for a left eye or, alternatively, outputting in thetime shearing manner said first picture signal for a right eye and saidsecond picture signal for a left eye alternately as one 3-D picturesignal when 3-D identification information is recorded on said opticaldisk.
 34. An optical disk reproducing device of claim 32, wherein areproduction process of an optical disk comprises steps of: reproducinga second picture data of said second interleaved block; storing saidsecond picture data on said buffer memory; making a synchronous timinginformation using said first timing information recorded on said firstinterleaved block; reproducing said first picture signal from said firstpicture data based on said synchronous timing information by said firstdecoder; reproducing said second picture signal from said second picturedata based on said synchronous timing information by said seconddecoder; alternatively outputting said first picture signal and saidsecond picture signal independently as a 3-D picture signal for righteye and a 3-D picture signal for left eye synchronized with said firsttiming information and/or second timing information and/or synchronizingtiming information and/or outputting in a time shearing manner saidfirst picture signal for a right eye and said second picture signal fora left eye alternately as one 3-D picture signal synchronized with saidfirst timing information and/or second timing information and/orsynchronizing timing information.
 35. An optical disk reproducing deviceof claim 34, further comprising a sound signal decoding means and aPicture-Sound synchronous means; reproducing a sound data of said firstinterleaved block taking precedence over the other; storing said sounddata on said buffer memory; decoding sound signals from said sound databy said sound signal decoding means; synchronizing said sound signalsand said picture signals by said Picture-Sound synchronizing means;outputting said sound signals.
 36. An optical disk reproducing device ofclaim 32, wherein a reproduction process of a optical disk comprisingsteps of: reproducing said 3-D picture signal for a right eye or lefteye from said first picture signal; reproducing a difference signal ofsaid 3-D picture signal and said first picture signal; decoding said 3-Dpicture signal for a right eye or left eye which is different from saidfirst picture signal based on said difference signal and said firstpicture signal.
 37. An optical disk reproducing device of claim 32,wherein said first decoder reproduce said first inter-lace signal assaid first picture signal; and said second decoder reproduces saidsecond inter-lace signal as said second picture signal.
 38. An opticaldisk reproducing device of claim 32, further comprising a first outputmeans and a second output means; wherein said first output means outputssaid 3-D picture signal and said second output means outputs saidinterlace signal which is composed of said first picture signal.
 39. Anoptical disk reproducing device player for reproducing at least a mainsystem stream and a sub system stream and a linking information betweensaid main system streams or said sub-system streams from an optical diskhaving interleaved blocks recorded thereon, said interleaved blockhaving an audio data and a video data having more than 1 GOP video data,comprising; STC generating means for generating a system time clock(STC) which is used as a reference clock for a reproduction of said mainsystem stream and/or said sub-system stream; a plurality of decoders forprocessing signals referred to said STC; a decoder buffer fortemporarily storing data of said main system stream and/or saidsub-system stream which is to be transmitted to said decoder; a STCreferred by said decoder when reproducing a first main system stream orsaid sub-system stream; STC switching means for switching said STC whendecoding said main system stream and/or said sub-system stream of asecond interleaved block that is reproduced successively afterreproduction of said main system stream and/or said sub-system stream ofa first interleaved block; wherein said main system stream and saidsub-system stream have a timing information respectively; and composingmeans for synchronizing a first video signal of said main system streamof said first interleaved block and a second video signal of saidsub-system stream of said first interleaved block referring to saidtiming information, composing into a single video signal and outputtingsaid single video signal.
 40. The optical disk reproducing deviceaccording to claim 39, wherein said STC is switched by said switchingmeans referring to a STC switching timing recorded in a managementinformation of said main system stream or said sub-system stream. 41.The optical disk reproducing device according to claim 39, wherein saidSTC is switched by said switching means when increase of a videopresentation time stamp (VPTS) information of said main system stream orsaid sub-system stream of said first interleaved block which is beingreproduced is ceased.
 42. The optical disk reproducing device accordingto claim 39, wherein data of one interleaved block of said sub-systemstream is first stored in a decoder buffer when said main system streamis recorded following to the sub-system stream at a head part of a videodata on said optical disk; said main system stream having same timinginformation as said sub-system stream having is next reproduced; andsaid decoder for processing signals then starts decoding.
 43. Theoptical disk reproducing device according to claim 42, wherein acapacity of a buffer memory of said decoder is set to more than a datavolume of said main system stream or said sub-system stream of oneinterleaved block.
 44. An optical disk recording device comprising: aseparating means for separating a original video signal verticallyand/or horizontally into a plurality of video stream including a firstvideo stream and a second video stream; said original video signal has afirst resolution; said first and said second video signals have a secondresolution that is lower than the first resolution; an MPEG encoder forvariable length encoding of said video stream; a time stamp means forproviding the same time stamp on said video stream which is separatedfrom the same original video signal; a data segmenting means forsegmenting said video stream into a plurality of interleaved blocks;each of said interleaved blocks having more than 1 GOP and less than 30GOP frame signal; where a first interleaved block of said first videostream and a second interleaved block of said second video stream arerecorded on tracks of said optical disk in a specific order.
 45. Theoptical disk recording device, wherein said first video stream comprisesencoded NTSC, PAL or SECAM signals.